This guide is more than just about how to perform a few advanced tweaks with the Catalysts. Whether you use the official Catalysts or the Omega drivers, this guide will help you out. It covers the entire driver installation, setup, troubleshooting and tweaking process from start to finish. From descriptions of important video-related BIOS settings to advice on what other drivers are necessary for optimal graphics performance, how to install and set everything up, how to clean your machine out of older drivers and devices, benchmarking, overclocking and easy-to-understand descriptions of graphics options such as Triple Buffering and Temporal Antialiasing. All this in one place for ATI users, and heck even Nvidia users will benefit from many of the descriptions and information in this guide!
http://www.tweakguides.com/ATICAT_1.html