I've been working on a project with the Raspberry Pi to make a Nintendo Gameboy style handheld that can play all of the original NES games. It's based on this project over at adafruit. So far it has been going really well, but I've hit a snag with getting the controls to line up correctly with the cutouts in the top cover, and getting everything to fit correctly inside - it seems like I've always got at least one button that doesn't line up right and I've got to open it up all over again. I need to do a little more fussing with it before it will be finished. Stay tuned!
too.