I use a 15.4" Dell Latitude D830 @ 1920x1200 and wouldn't trade it for any other laptop made. I'd say 1920x1200 is about my limit for a 15" LCD, but if anyone makes a 17" laptop that goes higher I'll be first in line. It's amazed me for years how under appreciated the value of high resolution is.
I had one of those screens, and I thought I would love it, but it ended up causing too much eye strain. Major headaches! Now I prefer small screens with moderate DPI on the go, and using a large external LCD when possible.
Right now I'm using a 37" 1080P LCD as my home monitor and an X60 as my laptop. I use the LCD to keep various communication tools open and the large LCD for coding/reading.
I'm using the same laptop + external monitor setup, but I'd actually like to use two external monitors. For me, screen space and RAM are the two important factors.
