A few months ago we got new dual monitors at work. It's been wonderful.
The coolest thing is to put the desktop over two monitors, like shown above.
How to do that? My dell has a 256MB ATI Radeon X1300PRO. I selected "Start/Programs/Catalyst Control Center/Advanced/Catalyst Control Center Advanced" then the "Displays Manager". I set the Desktop area to be 2560x1024.
I know its annoying to have the middle of the virtual screen interuppted with the monitor edges, but two 19" flat panels are really cheap compared to a 38" screen.