The Matrox G200 MMS can run up to 4 monitors simultaneously. It is PCI and can be run with 3 more to run 16 monitors. Check it out
here.
Mass Multiples makes quad-screens. They can be found
here. But they require individual outputs for each screen.
Appian makes a 4-display card. It doesn't appear to have DV support, but it is ATI driven. Look for the Rushmore
here.
Lots of links to products and information can be found
here.
Here's another link to some card and multiple screen manufacturers, plus stand manufacturers for placing regular LCDs.
It would seem to me that if you just wanted to use four monitors as a single monitor, you could build an adapter to split the signal. That's above my capabilities, but I don't see why not. It wouldn't let you create multiple desktops though. Multiple monitors from a single card support is essentially non-existant in W2K, but some of the multi-monitor card manufacturers have resolved this with driver solutions. If you go that route, check first. Quad cards seem to be starting at aroung $800, so it's not cheap. I think the last link has a chart somewhere that shows several cards and some basic info on them.
