Game titles we can expect to see include Left 4 Dead 2, Team Fortress 2, Counter-Strike, Portal, and the Half Life series. Even better news is that Valve intends to make simultaneous platform releases the norm from here on out. Expect Portal 2 to be the first game to be released on both Mac and PC at the same time.
Steam is Valve's digital delivery system for games (think iTunes for fragging);
It gets better. Valve's Jason Holtman explained how Steam Play and Steam Cloud work. "For example, Steam Play, in combination with the Steam Cloud, allows a gamer playing on their work PC to go home and pick up playing the same game at the same point on their home Mac. We expect most developers and publishers to take advantage of Steam Play."
Really? Are you kidding me?
Rumors of Steam coming to the Mac surfaced in February when users found OS X icons hidden within a beta version of the new UI for their system, and were all but confirmed when Valve themselves released these teasers. All that's left now is the hardest part: The waiting.