MVKTech has just posted an updated version of the extensive Guide on the NVIDIA BIOS Editor (NiBiTor) and a news posting would be much appreciated!
MVKTech just released an updated version of the NiBiTor guide for those who would like a better idea of how the application works. Our goals was to provide a generalized understanding on how to use the application properly and effectively. You will find information such as build history, BIOS support and a wealth of information that will bring a better understanding to its use. The guide is now compliant with the lastest release of NiBiTor (v2.5a - Released 15 November 2005).
(Nov., 16-2005) Revision: The guide has been adapted to reflect the newest version of NiBiTor, namely v2.5a. This is a maintenance and release adjusting some issues and adding native support for the new GeForce 7 series.
You can find this guide over at MKV Tech.