Is the Seti@Home project worth bothering with. Could all that computing power have been put to better use? How much has Seti@Home contributed to global warming?

I've given it my fair share of computing time in the past, but are there more worthy projects out there? Protein folding? Prime number searches?

My little pet project has been www.seventeenorbust.com, check it out! seti@home seems a bit too.. implausible to be very worthwhile, I think?

I had a Riemann Zeta Function zero calculating one, which was pretty cool since the statistical data they gathered on the zeros was actually useful to solving RH and related conjectures even if no one would have found a counterexample. It went down about two three years ago or so I think, so that's a bit useless now. This one seems quite interesting and I'll probably give it a try in the near future. There's also the classic, GIMPS, but the extent to which it's useful and the chance you actually have to find one are debatable.