At work we have some extra 17 inch monitors laying around. We also have some older Diamond Stealth video cards that are not being used. So a few weeks ago I grabbed an extra monitor, an extra video card. After a few tries with BIOS settings, and driver issues, I got dual monitors going.
One of my only issues, is due to the lack of resolution on the second monitor. My primary card is 1280x1024x16, while the second one is limited to 1024x768x16. I would have to goto 256 color to allow the new monitor reach the same size, but that might get to me after a while.
During the last week, I had an extra computer on my desk, and another monitor. Luckily, I have the room. Now I am thinking of grabbing an extra video card, since I have one more free PCI slot, and going for triple monitors.
That might be a bit excessive though...