>>64
TFLOPS isn't a measurement of how fast a CPU crunches numbers. It measures how fast the CPU executes instructions. How much the CPU actually gets done with each instruction is not taken into account, and is equally important when gauging its end productivity.
Moreover, the PS3 is only faster at doing a very specific set of mathematical problems, and a good deal slower for the rest. The Folding@Home client has been tailored to supply them with the specialty set. It's no PC killer.