Extraterrestrial life exists, it would be very selfish in thinking that we are the only "intelligent" life form on the whole universe. And we already have lots of proofs about ETs.
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.