Over at CeBIT, Samsung have been showing off their SyncMaster 940UX monitor which connects to your PC using a simple USB connection instead of the traditional DVI and VGA. The monitor apparently contains a flash drive which emulates a VGA card with the driver software on it, passing the data through a USB cable. Why would you want to do this? Well, as long as your CPU can handle it (and you have enough USB ports on your PC), this means you can connect as many displays as you want - three monitors for playing online games? Yes, please! Available in 19 inches initially, it's due out in May for $678, no word on UK pricing as yet. (via PC World).
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Unfortunately, there's no way usb would be able to handle the bandwidth needed for gaming.
USB2 is 480mbps at its very maximum. that's 40Megabytes.
There are graphics cards today with memory bandwidths of hundreds of gigabytes per second.
Most video cards these days have either dual-dvi, dual-dsub or one of each, so that's two monitors off the bat. There are cards with more options, but they're aimed at cad and video work, and not the kind of number-crunching needed for gaming.
I've got three monitors hooked up to my pc, two via the main AGP graphics card, and one via a pci graphics card. As you can imagine, it's not a gaming pc by any means. :)
I remember reading about a flight sim (linux-based?) that allows several computers to communicate over a network, synchronising their video output to create a panoramic cockpit view.
There was meant to be something similar for the original xbox, iirc.