CyDharttha writes with news that the Mac version of Steam went live today, along with Mac versions of Portal, Team Fortress 2, and many other games. Valve plans to make more games available every Wednesday. Several publications are also reporting that a Linux version of Steam has been confirmed, and is expected within the next few months. Quoting Phoronix: "Found already within the Steam store are Linux-native games like Unreal Tournament 2004, World of Goo, and titles from id Software such as Enemy Territory: Quake Wars and Doom 3. Now that the Source Engine is officially supported on Linux, some Source-based games will be coming over too. Will we finally see Unreal Tournament 3 surface on Linux too? Only time will tell, but it is something we speculated back in 2008. Postal III is also being released this year atop the Source Engine and it will be offering up a native client. We have confirmed that Valve's latest and popular titles like Half-Life 2, Counter-Strike: Source, and Team Fortress 2 are among the first of the Steam Linux titles, similar to the Mac OS X support. The released Linux client should be available by the end of summer."