Virtual Reality using a Nintendo Wiimote and IR LEDs
This is a fantastic application of the Nintendo Wiimote. Timo Fleisch of Germany has created a system that uses some Wii remotes which can be purchased at any local department store and some IR LEDs which are also readily available to create a very usable virtual environment. You hold an item infront of a monitor which will be displaying the virtual item, above this screen there is a Wiimote