Although I am an ATI fan, I am expecting the 6800 to be faster than ATI's latest (X800XT) - most of you won't want to hear that
I just think that with the final version NVIDIA will implement a lot better drivers - with the original tests as a foundation to how fast the card really is.
ATI will most definitely hae the upper hand using this new technology, and maybe this will be the only compatible port for their new card - we'll have to see.
ATI have hovered around "ATI and PCI Express" a lot more than NVIDIA.
Good Luck to both companies! (driver implementation is luck