If you guys haven’t seen this video of Johnny Lee’s Wii Remote hacks, it’ll blow you away. What he has done is taken an inexpensive $40 (or £30) Wii Remote and hacked it to do some extraordinary things. In order to track the position of the Wii remote, there is an infrared sensor on the top. Your Wii sensor bar emits beams of infrared light which the remote picks up and uses to track where it is. (find out how I took the following photo)
Anyway, he hacked it so it could be connected as a computer and would work in reverse: the wii remote is laid stationary (like a webcam) and then it tracks the movement of an infrared dot.
There is a fantastic interactive whiteboard built on the cheap and I think the headtracking program is just stunning.