Forget the mouse. Tobii Technology’s Gaze UI eye-tracking technology detects exactly where you're looking and treats it like the pointer on your display. We tried it out on a Windows 8 system, and, after fixing our gaze at any point on the spacious Metro live tiles, we launched apps. We could also sweep the screen to the left or right, or zoom using a combination of eye movements and touch gestures. We were even able to play a simple game of “Asteroids,” zapping flying space rocks just by looking at them. Though still a few years away from mainstream implementation, it's one of the thrilling innovation that leaves us wanting more.

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