[youtube http://www.youtube.com/watch?v=hhTNTPNs350&rel=0&color1=0xb1b1b1&color2=0xcfcfcf&feature=player_embedded&fs=1]
Not a lot to say about this little hack but it’s basically a Game Boy Advance attached to an Arduino device running a touchscreen. The stylus sends data back to the Arduino which connects to the GBA via a patch cable.