I'm not sure it's funky or not.
All I have to compare the 6600gt was the G3Ti200 it replaced. I assure you that the 'shimmering' effect I had with the G3 is still annoyingly present with the 6600GT, no matter the settings.
For me this 'shimmering' is most noticeable when scrolling through trees(scattered or woods) at low levels while trying to find the next hole for my guys to hide in.
I had assumed that the 'shimmering' affect was due to my having a low end card, now, I presume that other than 'fog' Nvidia holds no advantage over ATI when it comes to CM.
Again though, what amazes me is that every other game I play has improved dramatically in visual clarity.
< shrug> sh*t happens...every day.
KC