14 DAY TRIAL // As expected, it didn't take too long for AMD to release fixes for Elder Scrolls Skyrim. The 11.11a Performance Driver had some unsolved issues at the time of the release but things seem to be on the right way.
For a complete list of solved problems, please check the AMD Catalyst Performance Driver 11.11b download page on Softpedia. As noted by Andrew D., the Performance Driver should be used in conjunction with the 11.11 CAP 2 Catalyst profiles, to obtain the best results with the specified games.
Still a lot of feedback is expected as gamers will most likely find more issues with these new titles. Since the 11.11b is still very new, we are entitled to believe that a new version for the Performance Driver is to be expected in the next days/ weeks.
No official data on 11.12 has leaked so far, but Benchmark3D have tested the 11.12 Beta 8.93 and have seen a slightly better performance in comparison with 11.11a. No testing against 11.11b is available at the moment.
Most likely, at the moment, the 11.12 beta has no WHQL certification and that's why AMD are still keeping a low profile. You can get the AMD Catalyst Performance Display Driver 11.11b for XP, or for Windows Vista/ 7.