Those of you with Playstation 3's might find this interesting. Essentially, there's a client out that will enable your PS3 to perform equal to a supercomputer at calculating protein folding and such, allowing you to essentially donate your PS3s for the raw number-crunching of protein-related medical research.

The fun part: Sony actually developed this version of the Folding@home client, and it's available for official download on the PS3 itself.

The Main FAQ here explains what the Folding@home project is all about. There're clients available for other computing platforms as well (Windows, OS X, and Linux).