I have the latest versions, Core 2 Duo, of both the MacBook Pro and the Mac Pro. I can tell you that PS CS2 runs a little faster on the Mac Pro (2.66, 8 gigs ram, 512 VRAM) than it did on my G5 dual 2.7. However when 64 bit Universal CS3 comes out there should be a significant increase in speed. Also when Apple releases Leopard many of the other processes for the Intel macs should significantly increase in speed.
As of yet I have not used my MacBookPro (2.33 ghz,3 gigs of ram, 256 VRAM) for PS, however I will advise against getting the 200 gig drive because it runs at 5400 rpm and is noticeably slower. The 160 gig 7200 rpm drive is a faster choice. One improvement is that the MacBook Pro does not run nearly as hot as the other laptop computers I have.
I would also advise at this point against Parallels and would suggest that people who need to also run Windows on the new Intel Macs to use Boot Camp. Parallels has quite a few USB problems.