I prefer to just have one huge screen cause my desk doesn't have room for much more than that and I never really found it necessary.
For FPS gaming or sims it is generally assumed you will have 3 monitors, or perhaps six. I have used both (not on my rig, these were display models) the 6 screens were really just a massive screen with bezels in the picture, not obtrusive but noticeable. The three screens were better, or at least more unique, I played MW2 (not my choice) on it and the increased peripheral vision was cool but I still mostly focused on the center screen. It was very immersive in Shift 2 though especially as they had a wheel and pedal setup. If I was heavily into sims I could easily see myself forking over for three screens and a pedal and yoke set. These setups were ATI eyefinity display models, and they took up a massive amount of space.Vern said:They recently supplied us with dual monitors at work and I have to admit it comes in really handy. I still don't like that black border in the middle, but I regularly have 20 different things open at once, and I've gotten used to having some on one monitor, some on the other. It does come in handy not having to try to arrange everything on one monitor, and if you don't try to expand things across both screens it's pretty useful.
As for gaming though, I just can't see it. I haven't tried it, but the thing I could see as a problem is that generally your crosshair is in the middle of the screen, and if you use iron sights, those will be in the middle of the screen. It just seems like having that 3/4 inch separation would be a major distraction since generally when playing games I'm concentrating on the center of the screen and then glancing left and right. I wouldn't mind having a nice widescreen monitor at home, but I would rather just buy one of those than a second monitor and dealing with that bar in between them.