I don't know for some reason I thought on my machine the 67 drivers worked better than the 64. It was also curious to see that supported drivers are coming out soon for Vista. I will install these drivers and see how they run for me. I have heard problem from users on guru3d stating they can't enable SLI when downloading them though. I am a little weary of using them but I can always just re-installI was running 67. I saw a performance drop going from 44 to 67, but seem to have recovered with 69.
69 came out pretty quickly after 67 so I was figuring it was because of a flood of complaints about a performance hit.