Many laptops either have DVI or HDMI connectors. HDMI is DVI-compatible, and using a HDMI-DVI converter does not degrade the signal (though you lose audio).
The following manufacturers offer laptops with HDMI connectors. There are probably others who offer either HDMI or DVI, too.
I really didn't know that you could use the HDMI output - thanks for that. However, I wonder whether with a more modern graphics card than my ATI Radeon X700, you can set the ACD reolution separately from the laptop screeen and put the image on one and the pallettes on the other. This is one of the attractions of the MacBook Pro.My current set up is a bit clunky, I have to select the external monitor on its own to get its native resolution (1900x1200) .