I think E.T. exists but I dont think humans will necessarily discover it. I
believe we are still to limited from a technology standpoint. We cant even
find an earth threatening asteroid until its already past the earth in most
cases. I think we should transmit simply to try to communicate. Anyone who
looks to the sky and sees the millions upon millions of stars and believes
that there is not another planet somewhere (probably many) with intellegent
life at least as advanced as ours is a fool!
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.