http://blogs.amd.com/play/2009/09/11/ati-catalyst-99-driver-everything-you-want-to-know-and-why-you-should-care/
ATI CatalystTM 9.9 Driver has no new features but does have the following resolved issues:
Anti-Aliasing support for Ghostbusters
ATI CrossFireXTM support for Resident Evil 5
Graphics corruption fix for Sims 3
ATI CatalystTM Control Center - Basic mode now responds appropriately after exiting Quick Adjust Video Settings
Edge enhancement and de-noise sliders in ATI Catalyst Control Center no longer lags or appears out of sync with mouse movement
Launching Hotkeys Manager in ATI Catalyst Control Center no longer causes an unhandled exception error
The “Desktop Rotation” page in ATI Catalyst Control Center no longer shows additional information for the second display when the secondary adapter is connected
HDMI is now detected properly as DTV (HDMI) instead of DTV (DVI) when the HDMI display is hotplugged for the first time
ATI Catalyst Control Center no longer displays error message when specific HDMI displays are hot unplugged and hotplugged back
Intermittent failures no longer occur with Cyberlink MediaShow Espresso once a transcoding process has been completed