Seti@home is one of the most intresting screen savers i ahve ever used. Not only is it fun to look at and learn to understand but it helps "seek out new life and new civilizations".
If we find any borg though i hold Berkeley personaly to blame :P
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.