Although I've been aware of the project for some time, I've just recently been 'reminded' to contribute after reading about the project in a book received for my birthday.
The fact that my previous screen saver was also deemed 'unsuitable' was the final prompt.
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.