Matrox released this some time ago, but I just found it, so here it is:
The Triplehead2Go is a box you connect a single VGA (analog) out from your PC to and then connect 3 monitors to through it’s own VGA (analog) outputs. It’s not a graphics card – Matrox has decided to not compete with the likes of Nvidia and ATi, it processes the signal to create a max resolution of 3840×1024.
Reviewers rave about the size, immersion and cost of the product (3 monitors + the Triplehead2Go cost less than $1000) but unfortunately the desktop management software falls short, getting games to work properly can sometimes be a fiddle and if you have an ATi card you can forget about it. What surprises most reviewers is that there isn’t much of a framerate hit, and the bezels between the monitors doesn’t cause much disturbance to the viewer.
Good out of the box thinking by Matrox, but unfortunately it looks like this technology will have to mature a bit (by games manufacturers, ATi and Matrox) before it becomes a ‘must have’.