Catalyst 7.6 released
Performance gains of up to 42% are seen in Half-Life 2: Episode One with HDR and AA enabled. A 16% increase is also present in Dark Messiah: Might and Magic with HDR enabled. As noted by the release notes, bugs found in Quake 4, IL2 Sturmovik: Forgotten Battles and Armed Assault have all been resolved, along with multi-monitor support.
7.6 is available on the usual operating systems and is available for download from this page.