Valve is indeed planning to port some of its most popular games to the Mac, confirms the developer's marketing VP, Doug Lombardi. A teaser image (seen below) makes reference to Apple's famous "Get a Mac" ads, and the characters of Mac and PC played by Justin Long and John Hodgman. Standing in their place are turrets from Portal and Team Fortress 2, implying that these will be two of the first games to be ported.
