considering a laptop for Photoshop work as well... interesting ones (to me at least) are Sony W700 (or the W700ds with the second extendable screen), the HP elitebook 8730W with the dreamcolor panel as mentioned by Clown, and the Dell Studio XPS 16 with RGBLED screen as mentioned by lightrules... other than the Dell, other options still on Core 2, prob will be updated to i7 in the coming months... all 3 seem to have decent screens, leaning to the Dell as it is smaller and i7 available now... will plug into tabletop screen at home... pondering if I want to upgrade desktop or just max out on laptop...
faced the limited screen size issue trying to profile my Asus N10jc... if running XP, you could try extending the screen through the following process:
=> go to "Display Properties", "Settings" tab, click "Advanced" to go to graphics controller window...
=> select "Monitor" tab, at the "Monitor Settings" portion of the window, there is an option "Hide modes that the monitor cannot display" and a box that is probably ticked...
=> untick the box, go back to "Settings" on "Display Properties" and now you can select a bigger screen resolution than your monitor can support... 1024x768 should be good enough (that is also the minimum recommended size for Adobe Camera RAW, and for Adobe Illustrator you can't even install the program unless your screen is "hacked" to this extended size)... just have to scroll the screen by moving your cursor...
used this method, I have used a Spyder 2 and Coloreyes to profile the screen... the difference after profiling is very visible... if running other OSes, might have to try external monitor method YMMV...