My main box is watercooled 2.66GHz P4 overclocked to 3.2GHz on an Asus P4PE. That box does wu's in 2.5 hours! My other box is running an XP1800 on an Asus A7M266. My 1.6GHz Northwood will go at 2.4 GHz once again when Granite Bay motherboards come out.
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.