We wanted to evaluate the very cool Wifly module from Roving Networks. Sparkfun has a nice little 'breakout board'. We attached the breakout board via a pin/socket scheme, to a Radio Shack perf board and added an 'FTDI cable' connector and also level-shifter for the TX and RX signals.One of the great things about Sparkfun is that they provide Eagle schematic and pcb files under the CC-BY-SA licence. You may download their original Eagle files on the product page (see above). You may wish to view our modified version of their schematic also.The scheme for the level-shifting circuit was derived from Sparkfun's nice tutorial on the subject.Thanks Sparkfun!