AppleInsider is reporting that the latest build of Mac OS X 10.6.5 has been seeded to developers. One of the expected improvements is with 3D graphics support. As someone who as recently taken up the Steam habit this is welcome news for me.
According to this post on the AppleInsider forums it sounds promising:
From some I’ve the reports I’ve seen, Apple at the urging of Valve and others is really starting to get serious about their OpenGL implementation. With the drivers in development some willing to break the NDA have reported scores up to 3 times higher in OpenGL Viewer and significantly higher game performance on all cards.