I run SETI@home because I have available computing power to spare and it would be best used with this good cause.
This project is a fascinating endeavor. Bringing together the SETI community like this has never been done before, making this an honorable achievement.
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.