Matrox has just announced the newest addition to their video card line-up, the M9188 PCIe x16 Octal graphics card. The card is labeled as Octal because it can drive 8 displays at once. Yes, I said 8 diplays. The card has 2GB of memory and can run each display at up to 2560x1600 for Display Port monitors or up to 1920x1200 for DVI Single-Link monitors. It is a single-slot design so that it will not block other slots on the motherboard and allows room for additional cards. Two of these cards can be combined in one system to drive a total of 16 displays! The connected displays may be arranged in two ways: One arrangement is a single desktop stretched across all connected displays, while another option provides an independent desktop on each. This allows for either more space for one program, or multiple desktops to display multiple programs at once. Two keys areas that Matrox mentions the card would be beneficial in are electric grid management and train dispatch management. Both of these areas require displaying large visualizations of the grid or train tracks to effectively manage them. The M9188 will retail for $1995 and supports Windows 7, Windows Vista, Windows XP, Windows Server 2003/2008, and Linux.
If $1995 is too much or you only need to drive 2 monitors, Matrox is offering the M9128 LP PCIe x16 that can support 2 monitors. This card will retail for $259.