AMD Support now offers version 11.11b performance drivers for AMD/ATI graphics cards. The new drivers deliver performance and other improvements in The Elder Scrolls V: Skyrim, Assassin's Creed Revelations, Batman: Arkham City, and RAGE. These drivers are an "as is" release.
The performance gain on Skyrim with my 5850 was noticeable, but I've also picked up a silent CTD while playing. I don't know if this is due to the small Skyrim patch or the new drivers, but the 11.11b are installing now, so we'll find out.