TweakGuides has updated their Tweaking Companion for Vista
A quote from the article:
>> TweakGuides Tweaking Companion for Vista (Version 2.0)
The TweakGuides Tweaking Companion for Windows Vista has been significantly revised to Version 2.0, and includes all the changes from SP1. The most comprehensive, accurate and up-to-date guide to all things Vista, this free downloadable PDF contains over 250 pages of plain English descriptions of all of Vista's functionality, as well as every major performance and customization tweak.
>> TweakGuides Tweaking Companion for Vista (Version 2.0)