If you don't want to use the awful CCC:
If you're using XP x32, download the drivers from ATI's website via "Drivers and Software" -> "Windows XP" -> "Windows XP Drivers and Software" -> "FireMV" -> "Current Microsoft certified WHQL Drivers"
Download the "Display Driver, Control Panel" (
link,
direct link to exe, 22MB)
If you're on XP x64 then it isn't that simple unfortunately as the drivers without the CCC aren't listed under "FireMV"
Instead, download and install 5.11. These are the last drivers without the CCC. When this is installed, download the latest Cats (6.4) with the CCC. Don't uninstall the 5.11 drivers. Install the 6.4 drivers over the top, but ensure that you do not install the CCC (select Advanced install and uncheck it). Bingo, latest drivers, with just as good performance as with the CCC but without the bloaty memory hogging CCC. This is my current setup
I only upgraded from the 5.11 drivers to the 6.4 drivers as for some reason I couldn't select AA for Tomb Raider: Legend and Oblivion with the older drivers (works fine with the later drivers)