Students from the University of Texas have built a screen that you can't ever look away from because it follows your eye's every move. Seriously! An eye-tracking camera tracks where your eye is looking and the motorized pico-projector shoots out the display to that target. If you glance off to the right, the screen follows. Hell, if your eye twitches even a little bit, the screen is perfectly adjusted to where you're staring at.
It's only a student project right now (so its effectiveness is limited) but that sort of eye-tracking technology could be great in combination with Kinect or for any professional couch potato. [Pico Projector Info via Pop Sci]