Having a dual-monitor setup at home is great, but for traveling you can't top TwoView's Dual Flip-up Flat Panel LCD unit, which houses two LCD screens and a keyboard inside a suitcase-sized aluminum shell.
Once flipped open, out come two 15-, 17-, or 19-inch displays along with a built-in keyboard. The screens support resolutions of up to 1,280 x 1,024. You can even opt to have them LED-backlit. And because the LCDs are rugged, you don't have to worry about being extra careful with them. Sure beats lugging around two separate LCDs.