Just got word from Dave about a new LOD Bias Guide that he's just posted. Here's what he's saying.

Reverend has completed a short article on Texture LOD bias and FSAA / Anisotropic filtering using a GeForce4 Ti 4600. Nvidia's new GeForce4 Ti series of video chips affords the chance of tweaking one potentially popular unsupported feature, namely that of adjusting the MipMap LOD Bias. Actually, this LOD Bias "tweaking" is also available in NVIDIA's previous product line, the GeForce3. LOD Bias Guide @ Beyond3D