Hacking on the go? Need a painless interface to a laptop? Maybe you just need to do some basic pin toggling or you want to create a custom JTAG interface....
It's all possible with a simple thumb-drive sized GPIO module. This module is an FTDI based USB device that gives you a screw terminal I/O for every usable pin. Did you know that you can bit-bang GPIO on the FTDI chips? You can, and it's easy.