Yes, and the PS3 is going to make a big impact. According to a chart from the Folding at Home by OS stats:
1 Gigaflop per PC
3 Gigaflops per Intel Mac
30 Gigaflops of Folding Power per PS3
On average, of course. A researcher said that the basis for the 30x folding power, a very math intense process, is a $1000 PC you'd buy today. Impressive. Since the Tflop rating is the capable power, measured by units per time, the 826 PS3s doing Folding in beta are already doing 1/6 the processing of all the active Folding PCs out there, over 155k of them.