CD Player Becomes Gyroscope In Microgravity

From Neatorama:

NASA International Space Station Science Officer Don Pettit demonstrates how a spinning CD acts as a stabilizing gyroscope in microgravity. When two and three CD players are combined in perpendicular planes, they provide a relatively stable platform.

Something for the science nerds:

Now my question: Why the hell does NASA have three CD players on the International Space Station? It's 2009; get those boys some iPods, for Christ's sake.