Don't do SETI now. SETI 2 is comming sooner or later and the current one will end. Folding and Genome suck as you canot cach units and you have to be there to send the unit off if you are on dialup and unable to auto connect to the net.
I am currently crunching for AMDMB's SETI team:
(my units cruched)
If you can find a decent project that is capable of caching units then I will consider it. But I am getting ready for SETI2 as of now. Also SETI is way more in depth than just looking for ET. It has many uses like mapping out space ect...