TweakGuides.com posted a tweak guide for Unreal Tournament 3
A quote from the article:
Unreal Tournament 3 Tweak Guide
I've just completed the Unreal Tournament 3 Tweak Guide, covering all aspects of the game from basic to advanced. The guide should give all UT3 players the information they need to tweak and customize both UT3 and other games based on the new Unreal Engine 3 to suit their particular needs.
Unreal Tournament 3 Tweak Guide