The world of Mac gaming may change quite a bit on May 12. That's the day that Valve has just announced will be the time they will launch the native Mac version of their Steam PC game download service. Previously Valve announced that the Mac port for Steam would be released in April.

No other info about the Mac Steam launch was announced in the brief email press release. We do know that Valve's own games (Half-Life 2, Team Fortress 2, Portal, Left 4 Dead 1 and 2) will also be ported to run natively on Apple's machines. There's no word yet on what third party games will be included in the Steam Mac launch.