In Taiwan, Sapphire was showing a dual-GPU graphics card using X1950 Pro GPUs. 
If waiting for R600 has you down, Sapphire has an upcoming alternative.  Early this morning the company internally demonstrated its dual-GPU Radeon X1950 Pro board, dubbed The Godfather.  The dual-slot GPU uses two 6-pin power connectors but still fits within the standard 9″ riser-board dimensions.

Sapphire representatives tell us the performance of the single card is comparable to two Radeon X1950s in Crossfire mode.  The card runs on a single x16 PCIe connector. Both dual-link DVI connectors can be utilized at the same time.