The Seti@Home client is run on IDLE (can't stress this enough) machines here at the Computer-Aided Engineering center at the UW-Madison. When a machine is not in use by a person and not being used for resarch computations, then the Seti@Home client gets run. All our machines have the Condor batch processing system installed (http://www.cs.wisc.edu/condor/[/url]) to make use of idle CPUs.
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.