Motherboards.org reviews the Doublesight DS-1900, 2 dual linked 19″ LCDs on one stand.  While you may not get too much out of it for gaming, anyone utilizing programs that have huge amounts of menus will probably love the extra screen real estate.
“This DS-1900 dual display monitor setup is an excellent product, and some positives of the monitor include the ability to have 30 inches of viewable area horizontally, matching the highest end Cinema displays from Apple in the overall viewing area. If you want to watch a DVD and surf the Net at the same time, this monitor is perfect for you. If you’re a stock trader needing a lot of viewing space, this monitor is good for you as well. A flight simmer, who wants to play the games with a maximum viewing distance, will love these monitor too. A great job by www.doublesight.com !!”

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