I second Folding@Home.
There is a team ahead of us by about 1.75 months right now. It would be cool to maybe pass them sooner than later.
I just worry about a bunch of people downloading WU and then deleting them when they want to stop. That wouldn't help the cause to much. But, if people did a little reading on how to complete a WU and not download a new one (we could post instructions) - then that would be great. Stats upload many times a day, GLeeM does a great job on posting daily stats, and Extreme Overclocking has awesome stats!