Use Your Head: Eye Control Device Replaces Mouse
NaturalPoint TrackIR device lets you control your mouse pointer by head or
finger movement. 

From: Tom Spring, PCWorld.com - Tuesday, April 17, 2001

Eye Control Technologies has introduced NaturalPoint TrackIR. The $99 device
lets you stick a little computing power on your forehead and navigate your
digital world by moving your head.  

http://www.pcworld.com/news/article/0,aid,47604,00.asp
http://www.eyecontrol.com/
http://www.naturalpoint.com/