If only this were real.
The prospect of combining pico projectors (tiny projectors) with a camera excites me so much. Once the technology is small and powerful enough, we can mix projectors with cameras to project an image, and manipulate it by touch (like the projected keyboards in the video).
The way the idea works is the projector creates the image. When you touch the image, the camera determines where your fingers are, and executes the action accordingly.
Video via Gizmodo