From Stanford's Folding@Home Project blog:
"Two Million CPUs have returned work. We have just passed the 2,000,000 CPU mark -- 2M CPUs have at some time contributed to FAH. Right now, over 200,000 CPUs are actively returning work. With the addition of PS3 donors, Folding@Home is the most powerful distributed computing resource on the planet, and for the calculations we run (parallel independent molecular dynamics trajectories), the most powerful supercomputer of any type (distributed or otherwise)."