There's Beauty in Symmetry. The NVIDIA® GeForce® 7950 GX2 features a knockout pair of GeForce processors on one irresistibly powerful board. Resetting the bar for single board graphics performance with amazing 3D horsepower and speed, the GeForce 7950 GX2 enables a lightning-fast, hyper-realistic gaming experience with ultra-smooth frame rates. This dual-GPU board features an astounding 1 GB of fast GDDR3 memory and support for resolutions up to 2560 X 1600. It's a beautiful thing.
Many of the big tech sites have posted benchmarks and impressions of this new offering and it looks pretty darned awesome!
Newegg has several versions for sale @ around $650.
From the reviews I've read it's SLI on a single board, and YES, the darned thing is SLIable. so.... 2 dual GPU processors running on one board. (Apparently nvidia has only released the drivers to enable this to their PC vendor partners because they claim it is a pretty complex setup, but what I hear is that a solution for parts buyers will be available soon!)
Currently I'm still speccing out my new gaming rig, but if I pull the trigger any time soon this baby will be in there. Oh yes!