Finally, Valve has officially confirmed the release date for Steam on the Mac platform, with the streaming service confirmed for a May 12th launch. “Doug Lombardi, Valve’s VP of developer marketing says the first two games to be ported will be Portal and Team Fortress 2. Among the features available at launch will be Steam Play, which allows gamers to play a game on the PC, then continue to play on a Mac, right where they left off, as long as the game is available for both platforms. Additionally, Mac users will play in the same multiplayer “universe” says GI, meaning all platforms can play on the same servers. Most of the Steam catalog will not be available on the Mac side, but with Valve leading the charge, hopefully other developers will have incentive to convert their games to Mac as well.