Been running this, off and on, since the first beta, UNIX-only clients in 1999 or 1998 or whenever it started. Have run it most places I've worked since on non-production systems.
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.