I have been using multimonitor solutions by Matrox at work and home since 1997. I bought a Quad port G200 MMS when they first came out so I could get rid of the multiple Millenium II's I had crammed into my box.
Since then I have seen the graphics card market climb to dizzy heights. And my G200 MMS which is a PCI card with 8MB per chip is really showing it's age now. In XP I have to turn off all XP style graphics, and for my video editing purposes has been getting long in the tooth. The skinflint in me has been holding off for years, coz it was so bloody expensive to buy, I wanted to get every damn pennies worth from it... but today I bit the bullet and ordered a Matrox Parhelia 256MB card - I'm very excited
It great for video editing and photoshop among other things, and is average in gaming, so all in all it suits me well. I lose my 4th monitor, a TFT panel I bought late last year, but that will be used as a deicated monitor for my new linux FTP and mail server.
Can't wait for it to come