Performance improvements aside, the Vista x86 version of the drivers introduces AMD's ATI Avivo Video Converter. The converter can transcode videos to formats like MPEG-1, MPEG-2, MPEG-4/DivX, Windows Media Video, and H.264 using Radeon X1000-series cards.
As for the usual round of bug fixes, the Vista versions of the Catalyst 7.4 drivers fix issues in Battlefield 2, City of Heroes, Neverwinter Nights: Shadows of Undrentide, Quake 4, Romance of the Three Kingdoms XI, and Unreal Tournament 2004. In Windows XP, the new drivers resolve issues in 3DMark03-GT3, Call of Duty, Dungeon Lord, Prey, and Tribal Trouble. A complete list of bug fixes is available in the aforementioned release notes for the drivers.