Extraterrestrial life exists but we may not be capable of contact for a long time. Anyone that contacts or visits us will be far advanced from us and we will learn from them.
Yes we should transmit a beacon for others to find us. Star charts with our location and images.
I run SETI@home because I do believe we are not alone. It's a big universe out there.
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.