This looks interesting. http://www.fudzilla.com/content/view/17158/1/
It would be cool to one day have a external rack of RAIG (Redundant Array of Inexpensive Graphic), as opposed to the RAID we already know about (Redundant Array of Inexpensive Disks)
Maybe using the new high speed USB 6.0 standard as communications transport between the RAIG and the pc platform would be a cool idea. This would remove the limiting number of PCIX slots per pc, wouldnt that be cool to have a stacked expandable array of GPU's. With these puppies external to the pc, alot of heat and power problems could be solved more easily.