I think that it is not the question if extraterrestrial life exists, the question is, if they exist at the same time we do. To run SETI@home is for me the only way to give you a little assistance, because I think seti will need as much help which is ever possible. So maybe sometimes they can get results out of their studies of the signals from space.
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.