The Open Graphics Project is designing an "open source"
graphics/video board.  Supposed to have 2 dual-link DVI, and TV-out.

They recently released the preliminary schematic, and are looking
for people to review it.  Hardware bugs, changes that would help
the device drivers, etc.  If you have ever complained about a
hardware design, here is your chance to influence a design *before*
the mistake is committed to silicon.

schematic and BOM at:
http://natsuki.kinali.ch/

http://opengraphics.org/
Beware, some of the info here is out of date.

mailing list archive:
http://lists.duskglow.com/open-graphics

Step one is FPGA to work the bugs out.  (and perhaps useful for other things)
Step two will be ASIC ( smaller, cheaper, less heat, and faster then the FPGA )