STEAM has just launched it’s integrated Mac support. Dubbed “Steamplay”, the feature will allow users who purchase (or currently own) eligible titles for the PC to have playable copies on the Mac (and vice versa) as well. To celebrate the launch of Steamplay, Valve has released their award-winning first-person puzzle game, Portal, for free until May 24th. To get your copy, please visit http://store.steampowered.com/freeportal/