TweakHound has posted version 2 of their Windows Vista tweaking guide
>> Tweaking Windows Vista, Version 2.0
Welcome to the SP1 Edition of Tweaking Windows Vista. This is version 2.0 and includes several additions and clarifications. Like the XP tweak guide before it I've done my best to explain the tweaks without going overboard. I hope this guide will help you to make your Vista experience a little better.
>> Tweaking Windows Vista, Version 2.0