Good news for PC gamers who also have an Xbox Live account - Batman: Arkham City will be Games for Windows Live, as the first Batman: Arkham Asylum was.
The biggest takeaway is that those gamers who have a Gamerscore can add on to it with PC Achievements - and those of you who really are Gamerscore whores, they can rent the Xbox 360 version and get double Achievements for the same game.