I've set up my work computer to use two monitors now. It's pretty cool. If I had a camera, I'd post a photograph of it.

I find that using this dual-monitor configuration makes me more productive. Now, when I'm developing software, I can see my source code on the left monitor, and I can be running my application on the right monitor. It's nice to not have to ALT+TAB all the time.

In order to set up multiple monitors, you will have to either A.) Have two compatable video cards (usually people will do one PCI and one AGP), or B.) Procure a dual head video card. After trying to set it up with two video cards, and failing, I just bought a Matrox G450 video card, which has two outputs on it. So, I set my computer up with Option B.