Off topic post, I'm afraid. Just an ad, really, for Folding@Home Distributed Computing.
I've seen the SETI@Home project but I didn't really think that the research was important enough to bother with it all. However, the Folding@Home project is getting work done on protein folding which is a rather more compelling area to help out with.
So, think about letting them use your idle CPU cycles for this. You might end up helping to cure cancer or something (that's not a wild claim, by the way).