Vision-based interaction (and games)
LA audience plays NewsBreaker Live
Nintendo Wii has camera-based IR
tracking built in.  See Lee’s work at
CMU on clever tricks on using it to
create a multi-touch display!
Digimask:  put your face on a 3D avatar.
“Game turns moviegoers into Human Joysticks”, CNET
Camera tracking a crowd, based on this work.