It's almost like magic when it's working. The sensation you get is that the computer's reading your mind, and that's really very powerful.
Robert Jacob, professor of computer science at Tufts University, commenting on the incorporation of eye-tracking as a navigation device into common user interfaces. Cited in An Alternative to the Computer Mouse in today's MIT Technology Review.
update: Never assume that the YouTube video you're linking to is the clip you think it is if you don't listen to the audio -- all the way through. I didn't when I posted it. I just did now. And subsequently removed the link.
woops.
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