I think it's very clever for the creators of Batman: Arkham Assylum to have intentionally leaked a buggy version of their game to P2P networks a week before its release. That way the networks get flooded with this version right away and finding the real thing becomes almost impossible. The idea was slightly flawed, however, since the bug doesn't completely stop you from playing the game all the way through, but kudos for using the pirate networks against themselves. It's social engineering at its best.
Mokalus of Borg
PS - I'd expect to see a lot more of this in future.
PPS - It's one of very few success stories against game piracy.