Borderlands 2 has just made its way onto the Mac App Store. Note that this version does not currently have multiplayer support (and will not cross-playable with people with the Steam version when multiplayer is added).
UPDATE: I’m also told that the Mac App Store version launches at 25% off its regular price and will be updated with Game Center support early next year.
Exclusive to the Mac App Store, players will get the new “Fired Up” skins, along with a unique head for each character AND a Contraband Sky Rocket grenade mod.
My fav of the year this year. Even though I haven’t played Witcher 2 yet.