D3D Rightmark
Rightmark gives a broad view of theoretical performance for things like hidden surface removal, geometry throughput and general pixel and vertex shader performance.
NV40 ends up 2 or 4 times quicker than R360 in all but the geometry throughput test that uses the pixel and vertex shaders. We're CPU limited in that test in a big way, even 450MHz core frequency doesn't make the score move.
More confirmation of impressive theoretical performance from the new GPU.