to calculate something meaningful when cpu is idle, technology just pushing customer to upgrage and by new computer about each 2 year, why keep the computer idle before EOF?
besides, SETI@home is a very good way to keep the cpu busy ;)
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.