All of our future games will release simultaneously on Windows, Mac, and the Xbox 360. Updates for the Mac will be available simultaneously with the Windows updates. Furthermore, Mac and Windows players will be part of the same multiplayer universe, sharing servers, lobbies, and so forth.
And that's all thanks to the coders at Valve, which means Mac games fans should expect more companies to take advantage and port their stuff in Apple's direction. Does this mean I should switch? Well, I suppose I'll wait for Valve to release a paper-devouring game first: