I'm a graphic designer and long time user of a laptop for serious work. I'm getting ready to upgrade to a MBP 17 with all the trimmings, but if my current laptop is any indication of how much you can do on a Mac laptop, then so be it.
For the past 5 years I've used a PowerBook G4 667 for all of my work. Paired with a Radius 21" monitor (I know, getting pushed out the window soon for a 23" LCD) and used in an "over/under" display mode, this setup has carried me through years of 9-14 hour days, InDesign, PhotoShop, FileMaker Pro, Web work, and even 3D. Uh, yeah. Can't wait to get my hands on dual processors and 2.4 Ghz. 2 gigs of RAM is a minimum these days, and opting for a 7200 rpm, high cache HD will make a world of difference.
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JohnnyD - my business partner uses a G4 Powerbook and his Adobe apps (he's using CS1) never - I mean NEVER - crash. With CS(1) - my MBP was constantly crashing. Now that I'm on CS3 it's much less frequent but I can guarantee that every time I unplug my external monitor, either Flash or P'shop will crash - it's utterly predictable. P'shop will also crash occasionally for no obvious reason.
As a backup - I checked w/a friend who has 6 apple stations in his shop and he confirms that CS/CS2 is a POS in Rosetta on Intel MacPros. Especially if you have to use P'shop and Illustrator simultaneously.
Just be prepared to upgrade your Adobe suite fairly quickly (if you haven't already)