Folding @ Home has crossed the 1 petaFlop mark. That is pretty awesome. Much of it is being helped by the PS3.

View the Folding @ Home client stats by OS.

A petaflop equals one quadrillion floating point operations per second (FLOPS). If you'd like to imagine this enormous computation capacity, think about calculating a tip on a restaurant bill, now do that for 75,000 different bills, now do that every second, and lastly, imagine everybody on the planet is doing those calculations at the same second- this is a petaflop calculation. Now you see why I say say enormous ...

[Via PlayStation Blog]