Microsoft Kinect: ideas for possible applications

With the release of the Kinect, many new possibilities have been opened for amateur multimedia creators and programmers. How might this be incorperated into a live performance? The most obvious application is adding in virtual sets that actors can interact with, allowing for example, props that aren't fesible in real life. This augmented reality set would have to be shown on a screen of course, perhaps above the stage, but since people already are able to convince themselves that the world presented on the stage is a some sense real, this is really only a minor alteration in the audience's percept. Within this virtual environment, the bodies of the actors themselves could be manipulated. For example, if a character gets angry, his head could literally explode with rage. Perhap more interestingly, the characters inner thoughts and desires could be projected externally into the environment, and these things could themselves become props that the actors could interact with.