An anonymous reader writes with this excerpt from Gamasutra:
"Valve will release a version of its Steam digital distribution service for Mac next month, along with Mac-native versions of its own games, the company confirmed today after days of hints — and owners of Valve games will have access to both platform versions. The Source engine, which Valve uses to develop all its internal titles and also licenses to third-party developers, will incorporate OpenGL in addition to DirectX, to allow Mac support for all Source developers. ... 'We are treating the Mac as a tier-1 platform, so all of our future games will release simultaneously on Windows, Mac, and the Xbox 360,' said Cook. 'Updates for the Mac will be available simultaneously with the Windows updates.'"