I run SETI@Home so as to assist the scientists in finding aliens. :D In addition to that, I do not want to waste my CPU cycles when I leave my computer idling throughout the night - I do not shutdown my PC. I hope my AMD AthlonXP 2GHz and P4 1.6GHz machines can do the least to help in SETI. :)
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.