Folding@Home Distributed Computing

Have a computer?
Love giving?
Love to be a part of science advancement?
But don't want to forge out $$$?

Here's a great opportunity, Standford University has a distributed computing project which studies protein folding here:
Folding@Home Distributed Computing

Just go there and download and run the client software. It'll only run when your computer is idle.
And it has a cool visualisation of the protein that can be used as screensaver... :D