I run SETI@home because I believe the odds are there's more than just us in such a vast universe. SETI@home seems the most likely way for us to determine if this theory is true.
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.