NVIDIA sent us these benchmarks a couple days ago, and since they are up and about on the web already, we were allowed to go ahead and post them.  In addition to this table, I can personally vouch for the D3 and Halo numbers as I was in the room when the results were run and confirmed. 

6600 GT

6800GT

6800 Ultra

Single

SLI

Single

SLI

Single

SLI

Doom3

17.3

32

37.9

65.2

42.4

71.7

Halo

37.23

58.58

50.01

72.76

57.21

79.01

3DMark05

3186

5698

4588

8271

5211

9297