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A rack-mount computer system includes one or more rows of computer racks, wherein each row of computer racks includes a pair of rows of computer racks positioned back-to-back relative to each other, a plurality of computer motherboards mounted in each of the racks in each row of computer racks and h

A rack-mount computer system includes one or more rows of computer racks, wherein each row of computer racks includes a pair of rows of computer racks positioned back-to-back relative to each other, a plurality of computer motherboards mounted in each of the racks in each row of computer racks and having front edges open to a workspace for receiving circulating air over the motherboards, the motherboards positioned to create a warm air plenum near a back edge of each motherboard, and a fan positioned adjacent each of the plurality of computer motherboards to circulate air across the computer motherboards and into the warm air plenum.

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1. A rack-mount computer system, comprising: a first row of computer racks;a second row of computer racks, the second row disposed parallel and back-to-back to the first row, such that a warm air aisle is formed between the first row and the second row, and an ambient air space is disposed above the

1. A rack-mount computer system, comprising: a first row of computer racks;a second row of computer racks, the second row disposed parallel and back-to-back to the first row, such that a warm air aisle is formed between the first row and the second row, and an ambient air space is disposed above the first and second rows and on open sides of the first and second rows that are opposite the warm air aisle; anda plurality of cooling devices disposed at least partially within the warm air aisle, wherein a particular cooling device is configured to receive air from the ambient air space and through both of the first and second rows, cool the air, and output cooled air into the ambient air space,wherein the cooling devices comprise coils arranged within the warm air aisle between the open sides of the first and second rows of computer racks, the warm air aisle in fluid communication with the ambient air space only through one or more of the first and second rows and the cooling devices. 2. The rack-mount computer system of claim 1, wherein a temperature of an airflow on a cold side of the coils is substantially equal to a temperature of the ambient air space, and a temperature of an airflow between the first and second rows and a warm side of the coils is substantially equal to a temperature of the warm air aisle. 3. The rack-mount computer system of claim 2, wherein a temperature gradient between the ambient air space and the cold side of the coils is at least partially based on fan motor heat added to air circulated through the cooling devices. 4. The rack-mount computer system of claim 1, wherein a portion of the warm aisle extends above the first and second rows, and at least a portion of one or more of the plurality of cooling devices is disposed above the first and second rows. 5. The rack-mount computer system of claim 1, wherein the plurality of cooling devices are configured to carry substantially all of the cooling load of the first and second rows of computer racks. 6. The rack-mount computer system of claim 1, wherein particular ones of the computer racks in the first and second row are disposed on rollers that enable the computer racks to be moved without being lifted above a surface on which the rollers ride. 7. The rack-mount computer system of claim 4, wherein particular ones of the computer racks include a skirt that, when disposed in a sealing position, closes off a space near the rollers and under the computer rack, to thermally isolate, near the skirt, air from the ambient air space and air from the warm air aisle. 8. The rack-mount computer system of claim 7, wherein the skirt comprises a flexible sealing member. 9. The rack-mount computer system of claim 7, wherein the skirt, when disposed in a non-sealing position, is moved away from the surface to facilitate movement of the computer rack. 10. The rack-mount computer system of claim 1, further comprising a barrier that thermally isolates the warm air aisle from the ambient air space. 11. The rack-mount computer system of claim 10, wherein the barrier comprises one or more blanking panels between a pair of computer racks in the first row or the second row, wherein the one or more blanking panels thermally isolates the warm air aisle from the ambient air space in a region between the pair of computer racks. 12. The rack-mount computer system of claim 10, wherein at least one of the cooling devices comprises: a frame enclosing at least a portion of the cooling device; andone or more air movers attached to the frame;wherein the barrier is attached to the frame, and the cooling device is positioned between the first and second rows of computer racks such that the warm air aisle is defined between sides of the first and second rows of computer racks opposite the open sides and the cooling device. 13. The rack-mount computer system of claim 12, wherein the cooling device further comprises one or more rollers mounted on the frame that enable the cooling device to be moved without being lifted above a surface on which the rollers ride. 14. The rack-mount computer system of claim 10, further comprising a barrier between a pair of computer racks in the first row or the second row, wherein the barrier thermally isolates the warm air aisle from the ambient air space in a region between the pair. 15. The rack-mount computer system of claim 14, wherein the barrier comprises a flexible, sealing member that is configured to thermally isolate the warm air aisle from the ambient air space for a range of distances between the pair of computer racks. 16. The rack-mount computer system of claim 1, wherein each computer rack comprises a plurality of circuit boards, each circuit board having a front edge that faces the ambient air space and a back edge that faces the warm air aisle. 17. The rack-mount computer system of claim 16, wherein each circuit board slideably engages a slot in the computer rack, wherein the slot is deeper than the circuit board is long, such that when the circuit board is engaged in the slot, a space is formed between the warm-aisle side of the computer rack and the back edge. 18. The rack-mount computer system of claim 17, wherein the space is common to multiple slots, such that air can flow laterally, within the computer rack, from one slot to another. 19. The rack-mount computer system of claim 1, wherein the first and second rows of computer racks are disposed against, or in close proximity to, the plurality of cooling devices. 20. The rack-mount computer system of claim 1, wherein each of the computer racks has a width that is parallel to the first and second rows, and each of the cooling devices has a length that is parallel to the first and second rows; wherein the width and the length are dimensioned differently, such that the cooling devices and the computer racks are offset relative to each other. 21. The rack-mount computer system of claim 20, wherein the width and length are such that a maximum pitch of the computer racks is different than a maximum pitch of the cooling devices. 22. The rack-mount computer system of claim 1, wherein spacing of the computer racks in the first row or the second row, or spacing of the plurality of cooling devices, depends on a power density parameter of the computer system. 23. The rack-mount computer system of claim 1, wherein spacing of the computer racks in the first row or the second row, or spacing of the plurality of cooling devices, depends on a location of an architectural support member adjacent to at least one of the computer racks or cooling devices. 24. The rack-mount computer system of claim 1, wherein the back sides of the first and second rows of computer racks are substantially entirely open to the warm aisle, and front sides of the computer racks are open to the ambient space on a side of the racks opposite the warm air aisle so as to draw cool air from the ambient space and provide air that has been warmed while passing through the racks to the warm air aisle and the cooling devices. 25. A method for cooling heat generating devices, comprising: providing a first row of computer racks in a data center;providing a second row of computer racks in the data center in a location relative to the first row of computer racks so that the second row is disposed parallel to the first row, and a back side of the first row faces a back side of the second row so that an ambient air space is defined above the first and second rows of computer racks and adjacent front sides of the first and second rows opposite the back sides;providing a plurality of cooling devices in a location relative to the first and second rows of computer racks, such that at least a portion of the cooling devices are disposed between the first and second rows within a warm air plenum that is formed between the backs of the first and second rows, the cooling devices comprising coils arranged within the warm air plenum between the back sides of the first and second rows of computer racks, the warm air plenum in fluid communication with an ambient air space adjacent the front sides only through one or more of the front sides of the first and second rows and the cooling devices;circulating cool air from the ambient air space through front sides of the first and second rows of computer racks and over heat generating devices supported in the computer racks to warm the cool air;circulating the warm air from back sides of the first and second rows opposite the front sides into the warm air plenum andcirculating the warm air from the warm air plenum through cooling coils in the plurality of cooling devices and to the ambient air space. 26. The method of claim 25, further comprising circulating warm air from the back sides of the first and second rows to at least a portion of the warm air plenum located above one or both of the first and second rows of computer racks. 27. The method of claim 25, further comprising removing, with the cooling coils, substantially all of the heat added to the cool air to warm the cool air. 28. The method of claim 25, wherein providing a first row of computer racks in a data center comprises rolling the first row of computer racks into the data center without lifting the computer racks above a surface of the data center. 29. The method of claim 28, further comprising sealing a space near the rollers and under the computer racks to thermally isolate air from the ambient air space and air from the warm air plenum. 30. The method of claim 25, further comprising thermally isolating air from the ambient air space and air from the warm air plenum in a region between a pair of computer racks in the first row or the second row. 31. The method of claim 25, further comprising circulating air laterally between adjacent computer racks in the first row or the second row in a region between at least a portion of the heat generating devices and the backs of the adjacent computer. 32. The method of claim 25, further comprising: disabling one of the cooling devices in the plurality of cooling devices, the disabled cooling device located between a first computer rack in the first row and a first computer rack in the second row;circulating cool air from the ambient air space through the front sides of the first computer racks in the first and second rows by fans associated with at least one cooling device located immediately adjacent the disabled cooling device and over heat generating devices supported in the first computer racks to warm the cool air;circulating the warm air from back sides of the first computer racks into the warm air plenum andcirculating the warm air from the warm air plenum through one or more cooling coils associated with the at least one cooling device located immediately adjacent the disabled cooling device and to the ambient air space.