Check out the Dell M90 or M65 - both have the latest duo processors and be sure to take a look at the Alienware laptops as some of them have dual graphics cards and 2 hard drives which will speed up Photoshop a lot. Be sure to max out the ram on whatever machine you get. Ram and a 2nd hard drive for a scratch disk are the most important speed factors with Photoshop -- more important than the processor speed.
Or you could get one of the new Mac Intel Powerbooks.... but I'm waiting until they are out for about a year before I get one myself.
I have both a PC and Mac G4 laptop and I always prefer using the Mac for Photoshop.
www.dell.com www.alienware.com www.apple.comSteve