I've been messing about with the open source, cross platform ARToolKit. This uses your webcam to detect the relative position of a special pattern that you print out. I've also just stumbled on this face detection API that does a similar thing, but without the need for a special pattern (other than your face). The second video on this page suggests an interesting creative possibility. The API is a low level C library, so it would probably be fairly easy to integrate it into a hack of the Second Life client. The idea is that you would be able to tilt your head to see round objects slightly. This would be a massive help when building things in world, as you would get a much better sense of the relative position of objects in the 3D space.
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