Casey Chesnut took his Tablet PC and a webcam and experiemented with a camera-driven labryinth game. He explains his experience along with screenshots at /cameraFlow (thanks Scoble).
Since lately I've been in the workout mode I've been thinking about more fitness-related applications incorporating the Tablet PC. Anybody else here using their Tablet PC at the gym or to keep track of their activity at the gym? Any good ink-enabled apps to recommend along these lines?