Stanford University's Folding@home project uses distributed computing to analyze the folding of proteins and research their role in many well known diseases, such as Alzheimer's, Mad Cow (BSE), CJD, ALS, Huntington's, Parkinson's disease, and many Cancers and cancer-related syndromes.
It's easy, and you can be an hero to all humankind without lifting a finger. All you need to do is run the software in the background. Whatever CPU power you don't need goes to good use, and the software gives the CPU up easily when you need it. Compete against each other and against other teams, all for a great cause.
We could make a team for Think Atheist & sign up under our screen names or some variation, so we can recognize each from the site.
Just thought I would throw this out there.