Having some strange issues with the AF too, I believe it's the same issue that STROBE is having - despite having everything set at off or application controlled on the Nvidia control panel, everything still seems to be turned on. Here's some examples, hope they help.
GFX Card: Nvidia Geforce 6800 AGP
Driver: 169.21
Mip Bias sliders are all at zero, all options in the Nvidia control panel are at "application controlled" where available
I'm seeing some people here with blurry images, but I never get this, everything is always quite clear even with everything turned off
The images: the first one is with LFS's AF turned off. The second shows it with it on 1x, you can see a slight difference but nothing really major has changed, just small subtle changes. The third image shows it at 2x - here you can see that nothing has changed at all, it's exactly the same as at 1x. This also happens on all of the remaining higher settings, exactly the same.
Strangely, if I alt-tab or ctrl+f4, and then back again, I get image 4 - everything goes very sharp and grainy. This only happens on 2x AF and upwards - at 1x and off, it doesn't
No idea if this is an LFS issue or a driver issue, but anyway...