My main laptop is an IBM ThinkPad R40 with a Radeon 7500 M7 Video Card. Because of this, I have never been able to get Compiz Fusion working correctly on it. 
I have searched forum after forum to no avail. I finally got it working today with the help of an awesome script named Compiz-Check. Basically, this script tests Compiz to check if it is able to run on your system and if not, it will give you the reason(s) why. If you are having problems with Compiz, check out Forlong’s Blog and follow his instructions. After months of messing around with different xorg setups and drivers, Compiz-Check alerted me to the fact that my screen resolution was incompatible with Compiz. After a few tweaks and adjustments… voila! It worked! Major kudos Forlong!
Tags: compiz, compiz-check, fusion, Radeon 7500