Oculis Labs has two products, Chameleon and PrivateEye, that protect your screen from over-the-shoulder peepers in two incredibly novel ways. The catch that makes this product unique is that it uses eye tracking, something we haven't heard much of yet.
The high end, the Chameleon, costs $US10,000 and is targeted towards government offices that really need to protect secrets. It works by learning the unique way that a user's eye jumps around, called the "gaze pattern", and calibrates the text on screen. To anyone else, the screen sees a constantly changing jumble of text, to the user, he sees a Gizmodo liveblog.
A cheaper, webcam-based version called PrivateEye is just as interesting. It detects your eyes so that if someone comes in the room and you turn away, the screen will automatically blur to obfuscate whatever you were working on. It also displays the face of the person looking over your shoulder in a little video thumbnail so that you can see who's coming, and that person can see that YOU know he's in the room. That's available now for just $US20. [Oculis via Baltimore Sun via BalTech]