SETI@home and other distributed computing projects like it intrigue me because of the opportunity to contribute to something larger, as well as exploring the potential of the increasingly connected array of personal computers on the public Internet for something other than zombified, DDoS attacks.
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.