Multi-Touch using a Wii Remote
Recently noticed a project which explores how to create a multi-touch whiteboard using a Wiimote (The remote input device that is supplied with the Wii game console).
Essentially you create an LED flashlight that you use as a pen and this is detected by the infrared camera in the wiimote. The wiimote is positioned so that it can see the pen tip at all times and when used in conjunction with a projector it is possible to turn any surface, such as a table-top or even an LCD screen, into a "touch" tablet surface.
The wiimote can be used to track up to 4 devices at the same time so 2 "light pens" can be used to simulate a multi-touch device.
Although the tracking resolution will never be as good as a commercially available device, this system is sure to find an enthusiastic group of users.
More details at
http://www.cs.cmu.edu/~johnny/projects/wii/
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