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A perishable integrity indicator system includes a RFID transponder and a perishable integrity sensor. The RFID transponder includes a RF integrated circuit coupled with an antenna. The sensor monitors the time and temperature of the perishable. A freshness determining module receives time-and tempe

A perishable integrity indicator system includes a RFID transponder and a perishable integrity sensor. The RFID transponder includes a RF integrated circuit coupled with an antenna. The sensor monitors the time and temperature of the perishable. A freshness determining module receives time-and temperature-dependent measurement data from the perishable integrity sensor and determines a current freshness status. A communications interface to the RFID transponder permits a RFID reader to retrieve current freshness status data corresponding to the freshness status determined by the freshness determining module. The system further includes a power management module.

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What is claimed is: 1. A method for efficiently monitoring perishable integrity over multiple segments of a product supply chain, comprising: (a) providing a perishable integrity indicator system that comprises: (i) a RFID transponder including a RFID integrated circuit coupled with an antenna; (ii

What is claimed is: 1. A method for efficiently monitoring perishable integrity over multiple segments of a product supply chain, comprising: (a) providing a perishable integrity indicator system that comprises: (i) a RFID transponder including a RFID integrated circuit coupled with an antenna; (ii) a perishable integrity sensor that monitors the time and temperature of the perishable; (iii) a freshness determining module for receiving time-and temperature-dependent measurement data from the perishable integrity sensor and determining a current freshness status; (iv) a communications interface to the RFID transponder permitting a RFID reader to retrieve current freshness status data corresponding to the freshness status determined by the freshness determining module; and (v) a power management module; and (b) transferring the freshness status data to a second perishable integrity indicator system. 2. The method of claim 1, wherein the transferring comprises uploading from the first RFID system to a RFID reader memory and downloading to the second integrity indicator system. 3. The method of claim 1, wherein the transferring is by direct connection of the first and second integrity indicator systems via the first or the second communication interface. 4. The method of claim 1, wherein the second integrity indicator system comprises a RFID-configured system. 5. The method of claim 4, wherein the transferring comprises uploading from the first RFID system to a RFID reader memory and downloading to the second RFID integrity indicator system from the RFID reader. 6. A system for monitoring perishable integrity over multiple segments of product supply chain, comprising: (a) a first perishable integrity indicator system that comprises: (i) a RFID transponder including a RFID integrated circuit coupled with an antenna; (ii) a perishable integrity sensor that monitors the time and temperature of the perishable; (iii) a freshness determining module for receiving time-and temperature-dependent measurement data from the perishable integrity sensor and determining a current freshness status; (iv) a communications interface to the RFID transponder permitting a RFID reader to retrieve current freshness status data corresponding to the freshness status determined by the freshness determining module; and (v) a power management module; and (b) a second perishable integrity indicator system configured for transferring the freshness status data from the first perishable indicator system to the second perishable indicator system. 7. The system of claim 6, wherein the power management module periodically wakes up the freshness monitoring component from a sleep or other low power state to gather the sensor measurements. 8. The system of claim 6, wherein the memory comprises a RFID transponder portion for controlling the RFID transponder, and a dedicated sensor data portion comprising the freshness status data or special commands for retrieving the freshness data, or a combination thereof, and configured such that the freshness status data is directly accessible by the RFID reader without disturbing the sensor. 9. The system of claim 6, wherein a current freshness status is determined based on application of the measurement data to one or more predetermined temperature-dependent shelf-life trends stored in the memory. 10. The system of claim 6, wherein the second RFID indicator system is attachable to and detachable from the first RFID indicator system. 11. The system of claim 6, wherein the data are transferable to the second RFID integrity indicator system by uploading from the first RFID system to a RFID reader memory and downloading to the second integrity indicator system. 12. The system of claim 6, wherein the data are transferable by direct connection between the first and second integrity indicator systems via the first or the second communication interface. 13. The system of claim 6, wherein the second integrity indicator system comprises a RFID-configured system. 14. The system of claim 13, wherein the transferring of the data comprises uploading from the first RFID system to a RFID reader memory and downloading to the second RFID integrity indicator system from the RFID reader. 15. A perishable integrity indicator system, comprising: (a) a RFID transponder including a RFID integrated circuit coupled with an antenna; (b) a perishable integrity sensor that monitors the time and temperature of the perishable; (c) a memory module containing data representing one or more predefined temperature-dependent shelf-life trends; (d) a freshness determining module for receiving time-and temperature-dependent measurement data from the perishable integrity sensor and determining a current freshness status by applying the measurement data to the trend data from the memory module; (e) a communications interface to the RFID transponder permitting a RFID reader to retrieve current freshness status data corresponding to the freshness status determined by the freshness determining module; (f) a power management module; and (g) a security component configured to provide selective access to the freshness status data. 16. The system of claim 15, wherein the freshness monitoring module provides summary freshness information, or an alert when the freshness status data differs by a predetermined amount, or when a perishable is determined to be approaching an expected end of its shelf life, or combinations thereof. 17. The system of claim 15, wherein the freshness status data comprises integrations of temperature measurements over time. 18. The system of claim 15, wherein the one or more predetermined trends are provided in one or more data tables or equations or both. 19. The system of claim 18, wherein at least one of the trends comprises an exponential decay component. 20. The system of claim 18, wherein at least one of the trends comprises a linear component. 21. The system of claim 18, wherein at least one of the trends is customizable to expected temperatures over a perishable product's shelf life. 22. The system of claim 15, wherein the freshness status comprises a shelf life log that tracks time at fractions of shelf life lost. 23. The system of claim 15, wherein the freshness status comprises a custody log that tracks information relating to multiple custody periods over a perishable product's shelf life. 24. The system of claim 15, wherein said RFID transponder and said sensor comprise modules of a single integrated circuit. 25. The system of claim 15, wherein the RFID transponder and sensor are physically separate components and wherein communication interface comprises a one wire serial interface. 26. The system of claim 15, wherein the RFID transponder and sensor are physically separate components and the communication interface comprises a two wire serial interface. 27. The system of claim 15, wherein the RFID transponder and sensor are physically separate components and the communication interface connects the sensor to the antenna of the RFID transponder. 28. The system of claim 15, wherein the memory module further comprises one or more tables or calculations, or both, for determining and updating the freshness status data. 29. The system of claim 15, further comprising a display for providing visual freshness status information to a human observer. 30. The system of claim 15, wherein the freshness monitoring module compares the freshness status data to one or more predetermined trends, and provides an alert when they differ by a predetermined amount, or when a perishable is determined to be approaching an expected end of its shelf life, or both. 31. The system of claim 15, wherein the sensor further includes a humidity-dependent freshness monitoring component, and wherein the freshness monitoring module further receives humidity-dependent measurement data from the freshness monitoring component, determines a current freshness status based at least in part on the humidity-dependent data, and accordingly updates the freshness status data. 32. The system of claim 15, wherein current freshness status is determined based on a comparison of the measurement data with one or more pre-stored shelf life data tables or a fit to an equation or both. 33. The system of claim 15, wherein the sensor is configured to wake up in response to a RFID reader's wake command relayed by the RFID transponder. 34. A perishable integrity indicator system, comprising: (a) a RFID transponder including a RFID integrated circuit coupled with an antenna; (b) a perishable integrity sensor that monitors the time and temperature of the perishable; (c) a memory module containing data representing one or more predefined temperature-dependent shelf-life trends; (d) a freshness determining module for receiving time-and temperature-dependent measurement data from the perishable integrity sensor and determining a current freshness status by applying the measurement data to the trend data from the memory module, said freshness determining module including a first substantially temperature-independent clock and a second temperature-dependent clock, and wherein the measurement data includes first and second signals received from the first and second clocks, respectively; (e) a communications interface to the RFID transponder permitting a RFID reader to retrieve current freshness status data corresponding to the freshness status determined by the freshness determining module; and (f) a power management module. 35. The system of claim 34, wherein the freshness monitoring module provides summary freshness information, or an alert when the freshness status data differs by a predetermined amount, or when a perishable is determined to be approaching an expected end of its shelf life, or combinations thereof. 36. The system of claim 34, wherein the freshness status data comprises integrations of temperature measurements over time. 37. The system of claim 34, wherein the one or more predetermined trends are provided in one or more data tables or equations or both. 38. The system of claim 37, wherein at least one of the trends comprises an exponential decay component. 39. The system of claim 37, wherein at least one of the trends comprises a linear component. 40. The system of claim 37, wherein at least one of the trends is customizable to expected temperatures over a perishable product's shelf life. 41. The system of claim 34, wherein the freshness status comprises a shelf life log that tracks time at fractions of shelf life lost. 42. The system of claim 34, wherein the freshness status comprises a custody log that tracks information relating to multiple custody periods over a perishable product's shelf life. 43. The system of claim 34, wherein said RFID transponder and said sensor comprise modules of a single integrated circuit. 44. The system of claim 34, wherein the RFID transponder and sensor are physically separate components and wherein communication interface comprises a one wire serial interface. 45. The system of claim 34, wherein the RFID transponder and sensor are physically separate components and the communication interface comprises a two wire serial interface. 46. The system of claim 34, wherein the RFID transponder and sensor are physically separate components the communication interface connects the sensor to the antenna of the RFID transponder. 47. The system of claim 34, wherein the memory module further comprises one or more tables or calculations, or both, for determining and updating the freshness status data. 48. The system of claim 34, further comprising a display for providing visual freshness status information to a human observer. 49. The system of claim 34, wherein the freshness monitoring module compares the freshness status data to one or more predetermined trends, and provides an alert when they differ by a predetermined amount, or when a perishable is determined to be approaching an expected end of its shelf life, or both. 50. The system of claim 34, wherein the sensor further includes a humidity-dependent freshness monitoring component, and wherein the freshness monitoring module farther receives humidity-dependent measurement data from the freshness monitoring component, determines a current freshness status based at least in part on the humidity-dependent data, and accordingly updates the freshness status data. 51. The system of claim 34, wherein current freshness status is determined based on a comparison of the measurement data with one or more pre-stored shelf life data tables or a fit to an equation or both. 52. The system of claim 34, wherein the sensor is configured to wake up in response to a RFID reader's wake command relayed by the RFID transponder. 53. The system of claim 34 further comprising a security component configured to provide selective access to the freshness status data. 54. A perishable integrity indicator system, comprising: (a) a RFID transponder including a RFID integrated circuit coupled with an antenna; (b) a perishable integrity sensor that monitors the time and temperature of the perishable; (c) a freshness determining module for receiving time-and temperature-dependent measurement data from the perishable integrity sensor and determining a current freshness status; (d) a communications interface to the RFID transponder permitting a RFID reader to retrieve current freshness status data corresponding to the freshness status determined by the freshness determining module; (e) a power management module for periodically waking up the freshness monitoring component from a sleep or other low power state to gather the sensor measurements; (f) one or more additional perishable integrity sensors also communicatively coupled with said RFID transponder permitting the same or a different RFID reader, or both, to retrieve perishable data measured by the one or more additional sensors; and a security component configured to provide selective access to the freshness status data. 55. A perishable integrity indicator system, comprising: (a) a RFID transponder including a RFID integrated circuit coupled with an antenna; (b) a perishable integrity sensor that monitors the time and temperature of the perishable; (c) a freshness determining module for receiving time-and temperature-dependent measurement data from the perishable integrity sensor and determining a current freshness status; (d) a communications interface to the RFID transponder permitting a RFID reader to retrieve current freshness status data corresponding to the freshness status determined by the freshness determining module; (e) a power management module for periodically waking up the freshness monitoring component from a sleep or other low power state to gather the sensor measurements; and (f) one or more additional perishable integrity sensors also communicatively coupled with said RFID transponder permitting the same or a different RFID reader, or both, to retrieve perishable data measured by the one or more additional sensors; wherein the time-and temperature-dependent freshness monitoring component comprises a first substantially temperature-independent clock and a second temperature-dependent clock, wherein the measurement data comprises first and second signals received from the first and second clocks, respectively. 56. A perishable integrity indicator system, comprising: (a) a RFID transponder including a RFID integrated circuit coupled with an antenna; (b) a perishable integrity sensor that monitors the time and temperature of the perishable; (c) a freshness determining module for receiving time-and temperature-dependent measurement data from the perishable integrity sensor and determining a current freshness status; (d) a communications interface to the RFID transponder permitting a RFID reader to retrieve current freshness status data corresponding to the freshness status determined by the freshness determining module; (e) a power management module for periodically waking up the freshness monitoring component from a sleep or other low power state to gather the sensor measurements; and (f) memory for storing freshness status data including a security component to provide selective access to the memory. 57. The system of claim 56, wherein the freshness determining module comprises one or more tables or calculations, or both, for determining and updating the freshness status data. 58. The system of claim 56, further comprising a display for providing visual freshness status information to a human observer. 59. The system of claim 56, wherein the freshness determining module compares the freshness status data to one or more predetermined trends, and provides summary information, or an alert when the data differs by a predetermined amount from a trend or when a perishable is determined to be approaching an expected end of its shelf life, or combinations thereof. 60. The system of claim 56, wherein the sensor further includes a humidity-dependent freshness monitoring component, and wherein the freshness monitoring module further receives humidity-dependent measurement data from the freshness monitoring component, determines a current freshness status based at least in part on the humidity-dependent data, and accordingly updates the freshness status data. 61. The system of claim 56, wherein the time-and temperature-dependent freshness monitoring component comprises a first substantially temperature-independent clock and a second temperature-dependent clock, wherein the measurement data comprises first and second signals received from the first and second clocks, respectively. 62. The system of claim 56, wherein current freshness status is determined based on a comparison of the measurement data with one or more pre-stored shelf life data tables or a fit to an equation or both. 63. The system of claim 56, wherein the sensor is configured to wake up in response to a RFID reader's wake command relayed by the RFID transponder. 64. The system of claim 56, wherein the freshness status data is retrievable while the freshness monitoring component is in the sleep or other low power state. 65. The system of claim 64, wherein the memory comprises sensor memory. 66. The system of claim 64, wherein the memory comprises transponder memory. 67. A perishable integrity indicator system, comprising: (a) a RFID transponder including a RFID integrated circuit coupled with an antenna; (b) a perishable integrity sensor that monitors the time and temperature of the perishable; (c) a freshness determining module for receiving time-and temperature-dependent measurement data from the perishable integrity sensor and determining a current freshness status, including a first substantially temperature-independent clock and a second temperature-dependent clock, wherein the measurement data comprises first and second signals received from the first and second clocks, respectively; (d) a communications interface to the RFID transponder permitting a RFID reader to retrieve current freshness status data corresponding to the freshness status determined by the freshness determining module; and (e) a power management module for periodically waking up the freshness monitoring component from a sleep or other low power state to gather the sensor measurements. 68. The system of claim 67, wherein the freshness determining module comprises one or more tables or calculations, or both, for determining and updating the freshness status data. 69. The system of claim 67, further comprising a display for providing visual freshness status information to a human observer. 70. The system of claim 67, wherein the freshness determining module compares the freshness status data to one or more predetermined trends, and provides summary information, or an alert when the data differs by a predetermined amount from a trend or when a perishable is determined to be approaching an expected end of its shelf life, or combinations thereof. 71. The system of claim 67, wherein the sensor further includes a humidity-dependent freshness monitoring component, and wherein the freshness monitoring module further receives humidity-dependent measurement data from the freshness monitoring component, determines a current freshness status based at least in part on the humidity-dependent data, and accordingly updates the freshness status data. 72. The system of claim 67, wherein current freshness status is determined based on a comparison of the measurement data with one or more pre-stored shelf life data tables or a fit to an equation or both. 73. The system of claim 67, wherein the sensor is configured to wake up in response to a RFID reader's wake command relayed by the RFID transponder. 74. The system of claim 67, wherein the freshness status data is retrievable while the freshness monitoring component is in the sleep or other low power state. 75. The system of claim 74, wherein the freshness status data is stored in sensor memory. 76. The system of claim 74, wherein the freshness status data is stored in transponder memory. 77. A perishable integrity indicator system that comprises: (a) a RFID transponder including a RFID integrated circuit coupled with an antenna; (b) a perishable integrity sensor that monitors the time and temperature of the perishable; (c) a freshness determining module for receiving time-and temperature-dependent measurement data from the perishable integrity sensor and determining a current freshness status; (d) a communications interface to the RFID transponder permitting a RFID reader to retrieve current freshness status data corresponding to the freshness status determined by the freshness determining module and to download freshness status data to the perishable integrity indicator system from a second integrity integrator system; and (e) a power management module, (f) wherein the freshness status data comprises a custody log that tracks information relating to multiple custody periods over a perishable product's shelf life. 78. The system of claim 77, wherein the freshness status data comprises a shelf life log that tracks time at fractions of shelf life lost.