Mark May 12th on your iCalendar: Steam (and Portal and Team Fortress AND HALF LIFE) is coming to Mac!
Valve aren't simply bringing their games to Mac, though. They're also introducing 'Steam Play', an exciting feature that will let you save your game on a PC, and continue playing on your Mac! Or vice-versa! Also -- and this bit is gobsmacking if it's true -- both Mac and Windows gamers will exist in the same multiplayer universe: Mac and Windows will have the same lobby and server browser system.
I'll finally be able to kill Mac users in an online game.
May 12th will be a glorious day indeed.