SETI is one of the best ideas I have ever seen because it gives people someting to do with their screensaver other than watch small white dots fly out from the center of their screen and be forced into believing that this is a starfield.
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.