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Microfluidic devices having a plurality of functional features for performing one or more fluidic operations in parallel are provided. Reagents, samples or other fluids common to multiple functional features ("common fluids") may be input into a microfluidic device or system through one or more dis

Microfluidic devices having a plurality of functional features for performing one or more fluidic operations in parallel are provided. Reagents, samples or other fluids common to multiple functional features ("common fluids") may be input into a microfluidic device or system through one or more distributing inputs that divide and distribute the common fluids as desired. The use of a multi-layer fabrication technique allows multiple distributing inputs to distribute to multiple functional features in a microfluidic device without undesirable fluid channel intersections.

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What is claimed is: 1. A multi-layer microfluidic device comprising a plurality of device layers, the plurality of device layers defining: at least three functional features; a first, a second, and a third distributing input each associated with each of the at least three functional features; and

What is claimed is: 1. A multi-layer microfluidic device comprising a plurality of device layers, the plurality of device layers defining: at least three functional features; a first, a second, and a third distributing input each associated with each of the at least three functional features; and a channel crossover region that includes: a first distribution channel of the first distributing input, the first distribution channel defined in a first device layer of the plurality of device layers; a second distribution channel of the second distributing input, the second distribution channel defined in a second device layer of the plurality of device layers; and a third device layer of the plurality of device layers disposed between the first device layer and the second device layer, wherein the third device layer prevents fluid communication between the first distribution channel and the second distribution channel at the channel crossover region. 2. The multi-layer microfluidic device of claim 1 wherein: each distributing input defines a fluid flow path to each functional feature of the at least three functional features; each fluid flow path has a characteristic impedance to fluid flow; and the impedances of the fluid flow paths are substantially equal. 3. The multi-layer microfluidic device of claim 1 wherein: each distributing input defines a fluid flow path to each functional feature of the at least three functional features; each fluid flow path has a characteristic length; and the lengths of the fluid flow paths are substantially equal. 4. The multi-layer microfluidic device of claim 1 wherein the plurality of device layers further defines a plurality of fluidic outputs each being in fluid communication with at least one functional feature of the at least three functional features. 5. The multi-layer microfluidic device of claim 1, wherein the plurality of device layers further defines a plurality of independent fluidic inputs each being in fluid communication with at least one functional feature of the at least three functional features. 6. The multi-layer microfluidic device of claim 1 wherein at least one device layer of the plurality of device layers is a stencil layer. 7. The multi-layer microfluidic device of claim 1 wherein any device layer of the plurality of device layers is fabricated with a polymeric material. 8. The multi-layer microfluidic device of claim 1 wherein any device layer of the plurality of device layers is fabricated with a self-adhesive tape material. 9. The multi-layer microfluidic device of claim 1 wherein the at least three functional features are selected from the group consisting of: mixers, separation channels, reaction chambers, and analysis windows. 10. A multi-layer microfluidic device comprising: at least three functional features; at least three distributing inputs each including a plurality of channels, each distributing input being in fluid communication with the at least three functional features; a plurality of channel crossings; and an intervening device layer preventing fluid communication between any of the at least three distributing inputs at any channel crossing of the plurality of channel crossings. 11. The multi-layer microfluidic device of claim 10 wherein: at least one distributing input defines a fluid flow path to each of the at least three functional features; each fluid flow path has a characteristic fluidic impedance; and the fluidic impedances of the fluid flow paths are substantially equal. 12. The multi-layer microfluidic device of claim 10 wherein: at least one distributing input defines a fluid flow path to each of the at least three functional features; each fluid flow path has a characteristic length; and the lengths of the fluid flow paths are substantially equal. 13. The multi-layer microfluidic device of claim 10, further comprising a plurality of fluidic outputs each being in fluid communication with at least one functional feature of the at least three functional features. 14. The multi-layer microfluidic device of claim 10, further comprising a plurality of independent fluidic inputs each being in fluid communication with at least one functional feature of the at least three functional features. 15. The multi-layer microfluidic device of claim 10 wherein the device is fabricated with a plurality of device layers, and at least one device layer of the plurality of device layers is a stencil layer. 16. The multi-layer microfluidic device of claim 10 wherein the device is fabricated with a plurality of device layers, and any device layer of the plurality of device layers is fabricated with a polymeric material. 17. The multi-layer microfluidic device of claim 10 wherein the device is fabricated with a plurality of device layers, and any device layer of the plurality of device layers is fabricated with a self-adhesive tape material. 18. The multi-layer microfluidic device of claim 10 wherein the at least three functional features are selected from the group consisting of: mixers, separation channels, reaction chambers, and analysis windows. 19. A multi-layer microfluidic device comprising: a functional device layer defining at least three functional features; a first device layer having a first set of distribution channels in fluid communication with the at least three functional features; a second device layer having a second set of distribution channels in fluid communication with the at least three functional features; and a third device layer having a third set of distribution channels in fluid communication with the at least three functional features; wherein the second device layer is disposed between the first device layer and the third device layer. 20. The multi-layer microfluidic device of claim 19 wherein: any of the first, second, and third set of distribution channels defines a plurality of fluid flow paths; at least three fluid flow paths of the plurality of fluid flow paths has a characteristic fluidic impedance; and the fluidic impedances of the at least three fluid flow paths are substantially equal. 21. The multi-layer microfluidic device of claim 19 wherein: any of the first, second, and third set of distribution channels defines a plurality of fluid flow paths; at least three fluid flow paths of the plurality of fluid flow paths has a characteristic length; and the lengths of the at least three fluid flow paths are substantially equal. 22. The multi-layer microfluidic device of claim 19 wherein any of the functional device layer, the first device layer, the second device layer, and the third device layer includes a plurality of sublayers. 23. The multi-layer microfluidic device of claim 22 wherein the plurality of sublayers includes a stencil layer. 24. The multi-layer microfluidic device of claim 19 wherein any of the functional device layer, the first device layer, the second device layer, and the third device layer is a stencil layer. 25. The multi-layer microfluidic device of claim 19 wherein any of the functional device layer, the first device layer, the second device layer, and the third device layer is fabricated with a polymeric material. 26. The multi-layer microfluidic device of claim 19 wherein any of the functional device layer, the first device layer, the second device layer, and the third device layer is fabricated with a self-adhesive tape material. 27. The multi-layer microfluidic device of claim 19 wherein the at least three functional features are selected from the group consisting of: mixers, separation channels, reaction chambers, and analysis windows. 28. A multi-layer microfluidic device comprising: a first device layer defining at least three functional features and a first distributing input in fluid communication with each of the at least three functional features; a second device layer defining a second distributing input in fluid communication with each of the at least three functional features; a third distributing input defined in one of the first device layer or the second device layer, the third distributing input being in fluid communication with each of the at least three functional features; and a third device layer disposed between the first device layer and the second device layer. 29. The multi-layer microfluidic device of claim 28 wherein any of the first distributing input, the second distributing input, and the third distributing input defines a plurality of fluid flow paths, and at least three fluid flow paths of the plurality of fluid flow paths are substantially impedance-matched. 30. The multi-layer microfluidic device of claim 28 wherein any of the first distributing input, the second distributing input, and the third distributing input defines a plurality of fluid flow paths each having a length, and at least three fluid flow paths of the plurality of fluid flow paths have substantially the same length. 31. The multi-layer microfluidic device of claim 28 wherein any of the first device layer, the second device layer, and the third device layer includes a plurality of sublayers. 32. The multi-layer microfluidic device of claim 28 wherein the plurality of sublayers includes a stencil layer. 33. The multi-layer microfluidic device of claim 28 wherein any of the first device layer, the second device layer, and the third device layer is a stencil layer. 34. The multi-layer microfluidic device of claim 28 wherein any of the first device layer, the second device layer, and the third device layer is fabricated with a polymeric material. 35. The multi-layer microfluidic device of claim 28 wherein any of the first device layer, the second device layer, and the third device layer is fabricated with a self-adhesive tape material. 36. The multi-layer microfluidic device of claim 28 wherein the at least three functional features are selected from the group consisting of: mixers, separation channels, reaction chambers, and analysis windows.