The Atmel AT90USBKEY is a great little development board. The problem is that the pads for the 6 sets of port pins are almost too tiny to work with. Adapt these tiny 2x5 (0.1"x0.05") port-pin headers of Atmel's AT90USBKEY development board to standard 2x5 (0.1"x0.1") headers. A set of 6 converts all of the port pins to standard 0.1" headers. Board dimensions are 0.275"x0.812". Let the prototyping begin! You provide the header pins.
Order a set of our Female to Female jumper cables to connect to your header pins.
Background info on project can be found at AVRfreaks here.