I think that S@H is a great idea. The use of the masses to "crunch" the data is really brilliant. By reading S@H stats I can see where the power of the masses has really only been scratched and the potential is really interesting to think about.
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.