There's currently a story at AMDZone (linked from Slashdot...AMDZone is currently slashdotted) on a Q&A session at Quakecon. Looks like the Mac port of Doom 3 might still be a long way off completion. From the article: "A Mac gamer asked about the port to OS X. Apparently there is no current time for the release of a port. The game runs, but there is a lot of optimization, and currently they feel the Mac platform can not yet offer the same experience as the PC. Activision will not publish the Mac version of Doom 3. There is no publisher set currently."