I just remembered that Colographic, the company that did the first VGA card for a Pocket PC, do the multi-monitor thing. How about this?
http://www.colorgraphic.net/newsite/...gt8_models.asp
Xentera GT 8 (Available in PCI form factor)
Support for eight screen VGA output at up to 2048x1536 per display
Support for quad screen DVI output at up to 1600x1200 per display
Support for quad screen TV output in NTSC or PAL
256 MEG SGRAM total with four VPUs
It's $800 USD, which is pretty cheap all things considered. :-)