I read about this new LG LCD screen than can connect up to 6 LCD screen via USB, 1 on the normal VGA port and 1 on a D-sub port. It then gives you 8 screens on a laptop/pc.
Here are the link: http://www.lge.com/products/model/detail/L206WU.jhtml
It might be a solution for someone's' cockpit project. I would love to see how the 6 screens on USB performs.