Using infrared (IR) light pens and the Wii Remote, it is possible to create very low-cost multi-point interactive whiteboards and multi-point tablet displays. Johnny Chung Lee, Carnegie Mellon University.
http://www.youtube.com/watch?v=5s5EvhHy7eQ
Tags: Hacks, open source, Video, Wii
Using an IR led array and some reflective tape, you can track fingers in thin air using the Wii Remote by Johnny Chung Lee, Carnegie Mellon University. The grid software is a custom program written using a C# wiimote library and DirectX.
http://www.youtube.com/watch?v=0awjPUkBXOU
Using the infrared camera in the Wii remote and a head mounted sensor bar (two IR LEDs), you can accurately track the location of your head and render view dependent images on the screen. Check out this video, created by Johnny Chung Lee of Carnegie Mellon University.
http://www.youtube.com/watch?v=Jd3-eiid-Uw