Check out this Wii hack, someone got a Nintendo Wii to play on iPod!
Just playing some Wii… on my 60GB iPod. Basically in a nutshell I just rewired my dock with the lightbar from the Wii. Then running linux and a app that I installed on the iPod, enabled it for live video stream via the 30pin dock connector (ie. instead of video out I can have video in) Then with a few splicing of the composite video connectors and some electrical tape to convert it to the S-Video jack on the back of the dock. The audio was passed through to a reciever and not through the iPod.