these new drivers caused the menu to crawl and started to lead to that over-heating issue. i have a 5970 and everything was fine with 10.7 (except jaggies) and temps were no more than 78 after playing a few hours.
with 10.7a, the main menu was unresponsive (the star streaks barely moved) and after 10 min my card temp hit 87. once i added that frame rate cap and set catalyst ai to off (which i think causes my card to only use one gpu), things got better. i still had to turn aa down to only 4x (keep it at 16x for batman and dirt2) to get playable frames. this only problem is that aa only fixed the jaggies in game, but not during all the between mission scenes where the jaggies are really noticable (catena, bridge, etc). i think i'm going back to plain 10.7 tonight.