nVidia FX5200 128MMB AGP card on the middle and right monitors, random Matrox PCI card for the left monitor (same PC in my sig). It's nothing amazing. I wish I could have found another MAG silver monitor so they would all be the same, but they are pretty close in size, so I don't care. I got one MAG and the Samsung for free, the other MAG for $20, not a bad deal.
I'm building another system and in hopes of getting a GeForce 7600GT 256MB PCI-e card for it. I have 2 matching 19" CRT monitors and will do a dual monitor setup with that one. I'll post that up here later if I ever get it done.