Stromotion - Stop-Mo Computer Wizardry or New European Athlete Cloning Technology: You Decide

(click image for larger pic)
collision detection: The Dartfish Olympics:

Stromotion - software that breaks an athlete's fluid movements into stop-motion-style freeze-frames.

The tres cool software is made by the Swiss company Dartfish, and apparently Olympians have been using it to train in an incredibly innovative way: They take a performance of a classic Olympian from the past and run it alongside their own, with both broken down into Stromotion frames.

(snagged from kottke)