Remember, son, many a good story has been ruined by over verification - James Gordon Bennett
The page here shows 30,915 PS3 CPUs as responsible for 492 TFLOPS of processing.
In comparison, some 162,197 Windows PCs manage some 154 TFLOPS of calculations.
The site measures TFLOPS as the actual teraflops from the software cores, "not the peak values from CPU/GPU/PS3 specs" and notes that Active PS3s are defined as those which have returned WUs within two days.
Perhaps there's something in the claims for that new-fangled Cell chippery after all. µ
See Also
Sony plugs PS3 into folding@home