I bumped into a computer science prof who was lugging a cart to get coffee. On the cart was a big homebrew remote controlled car, with a Microsoft Kinnect sensor strapped to it. Turns out, they use it to capture the motions of athletes. They use the data both to analyse the motion later, and to provide immediate audio feedback to the athlete. They're working on a model that can follow speed skaters, at full speed, around the track. Awesome!