Camera and projector based User Interface

The ACM Symposium on User Interface Software and Technology (ACMUIST) has an interesting proof-of-concept video up demonstrating the use of cameras and laser pico-projectors to 'extend' a laptop's user interface to adjacent surfaces. The video demonstrates some simple gestures like tapping and dragging being captured on the 'extended' surface. While the prototype appears to be somewhat cumbersome, it's easy to see how it might be more elegantly integrated into the hardware with more R&D.