I have been running seti on at least my machine and sometimes that of my roommates and now that Galls has finally joined the silicon generation I run the command line version at work(old style only-no admin access)
I think that life in the universe is probable but its not likely that we will ever meet it. Running Seti is a way to put those millions of CPU cycles to use for something that might come of some good within my lifetime.
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.