I don't know if intelligent life exists outside of Earth or not. Unlike a lot of SETI @ Home users, I don't think it's necessarily arrogant to doubt the presence of E.T. I'll always remain open to the possibility, but I'll always doubt it.
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.