Matrox M-Series Graphic Cards
Matrox Graphics (are they still alive?) has a new range of graphic cards - the M-Series. “M” stands for Multi-monitor, and the cards offer (only?) 512MB memory, native PCIe x16 and the ability to support up to 4 monitors. They're not meant for ordinary office drones, but was specially designed to cater for display-hungry professionals including financial analysts, media professionals, bloggers, and folks who need to work on more than a single monitor at the same time. You can install up to two monitors per card, with resolutions maxing out at 2,560 x 1,600 per display, or four monitors at lower resolutions, depending on the card model. The M-Series consists of the following models :

* M9120 PCIe x16 ($259)
* M9125 PCIe x16 ($399)
* M9120 Plus LP PCIe x16 ($329)
* M9120 Plus LP PCIe x1 ($329)
* M9140 LP PCIe x16 ($599)

They'll roll out sometime in Q3 this year. I suspect that you can find Dual-Dual-Link DVI (drives two 2560x1600 displays) cards from either NVDIA or ATI that actually offers graphics performance at a lower cost…