We don't tend to look at NVIDIA drivers regularly. The main reason for that is because NVIDIA don't normally release major ones on a regular basis. Sure, we see a constant flow of beta and WHQL ones, but if we tested all of them all we'd ever be doing is testing NVIDIA drivers. Instead, we just test them when a more major release comes out.
This is one of those times; we're moving from the 197 Series and into the 257 series and NVIDIA are promising some massive gains for its newly released GTX 400 series cards. Sure, the cards got off to a bit of a bumpy start, but hopefully today we'll be able to see some nice performance gains as we test both the GTX 470 and GTX 480 while at the same time looking at the GTX 470 in SLI. Check it out at TweakTown.