something kind of neat that i found(i didnt see any other threads about this). a portable wii. i dont know how well it would actually work, but it looks pretty cool for being homemade.
An exert from the page:
Quick specs, this unit has a built-in close-range sensor bar, stereo sound, Gamecube port, 16:9 widescreen LCD, A/V jacks, port for external stock sensor bar, built-in power supply and even a compartment for the cord. It measures 8.6" wide, 7.7" long and 2" total thickness.
and the site:
http://www.benheck.com/just scroll down the page a bit for the pictures(and a making of).
edit: it actually seems to work pretty well. the site has a link to a video of the unit in action.