At this month's DEFCON hackers' conference, engineering students Josh Marks, Rob Rehrig and Larry Aiello did a demonstration of their project WiiAssist, (PDF here) which allows people with disabilities to use the Nintendo Wiimote as a head-pointer and the Wii Balance Board as a mouse. VultureBeat's Dean Takashi writes:
"[T]he project adapts the infrared sensors in the Wii controller, which detects a Wii game player’s motion and position, so that it can be attached to someone’s head. The sensor is then used to track head movements, which can control a mouse in a computer application."
The University of Delaware students chose the Wiimote in part because it can track up to four infrared sources and it has Bluetooth capabilities, as well as an open-source library for Windows and Linux machines called Wiiuse, which supports "motion sensiong, IR tracking, nunchuck, classic controller, and the Guitar Hero 3 controller."
Long-term goals for WiiAssist include sign language recognition and a design that uses less power and fewer wires.