AMD has released their last Catalyst WHQL drivers for the year of 2011.
These new 11.12 drivers have no listed performance improvements but they fix a large number of fixes for both Windows 7 and Windows Vista. The fixes are mostly related to gaming such as texture glitches, random freezes and crashes. A funny typo on the release notes is the mentioning of a fix for Stalker: Metro 2033 since 4A Games (creators of Metro 2033) was founded by former GSC Game World employees (creators of STALKER). The later which very unfortunately is going trough hard times.
Apart from the previously mentioned fixes there are also some other minor improvements. You can read in detail all the fixes and improvements in the official release notes here.
You can download the latest Catalyst WHQL drivers here.