Please see the Folding @ Home site at http://folding.stanford.edu/
. For further reference look at the Wikipedia article searching from folding at home.
The SuSE Linux Users, team number 35676 could certainly use a few more good CPUs!
In a very short summary, you can join the world's most powerful super computer, which is always a a nice little ice breaker in a social setting. I personally like to have my PC always on & ready for instant computing, which could be called socially irresponsible. However, since I'm donating my spare CPU clock cycles to justifiable science, my conscience is completely clear.
I found it fairly easy to set up and use and the help sites are out there. I did find that my AMD Athlon 64 X2 6000+ did want a better cooling fan than the AMD supplied one, but that was partially because I wanted to be a bit conservative in CPU temps.
I hope to see you soon!