Since this past weekend I've decided to dedicated a piece of my resources to the folding@home project sponsored by standford.edu. Folding@home is a massive cluster (made by you) dedicated to computing protein folding.  The interesting thing about the project they use the data we compute to study life threatening disease like cancer and Alzheimer's. Hopefully some day these diseases can solved by our efforts to simulate them. If anyone is interested in the project please stop by http://folding.stanford.edu/ and also check out the wiki at http://en.wikipedia.org/wiki/Folding@home
There's basically a client for every platform including:Â Linux, Mac, & Windows
and even the PS3 on the cell architecture.