I've got my computer running Folding@Home.
Well, I have four processors running it, actually!
It's a distributed computing program that models protein folding.
BaptistBoard has a folding team, the thread is
here.
I'm folding for a different team, but if anyone isn't already donating spare processor cycles this is a good thing to sign up for.
Nowhere near as cool as a whole virus, but you've got to start somewhere!