Yes, that's a good site for comparing GPU's. If you notice the 9600 has about twice the FLOPS as the 8600, that's what's going to count with CUDA type uses for GPU's. I'm wondering what the nVidia roadmap is for mobile GPU's. One thing that might help us get a better GPU in Macbook Pro's is the fact that the next mobile cpu is going to change the FSB and lower the power needed overall by about 10 Watts. It looks the the Apple philosophy is to take limit the GPU you put in by the thermal envelope. So the fact that the 9600m GT takes 23 Watts and the 9800m GT takes 65 Watts could be a big reason it's not in the Macbook Pro.
I've not been able to find anything about the nVidia roadmap for mobile GPU's. It would be nice to know if nVidia was planning to update their mobile GPU's this year, hopefully the economy hasn't slowed them down.