Why Would I Want a Multi-Display Setup?
In the business world, dual displays can prove to be quite advantageous. You can view multiple documents at once. Applications such as Adobe Photoshop and AutoCAD can have their toolbars dragged onto the second monitor so the entire primary display’s real estate can be used for manipulating an image.
In the recreational arena, many games like Unreal Tournament Edition and Quake now support multiple monitors, allowing you to utilize your multiple displays during game play.