According to this GamersHell piece, EA is giving away 100 horror DVD as an incentive to sign up to the Dead Space newsletter, which you can find here. The films have been picked by the team, so you may as well.
In addition, the game's fourth development diary's been released. We haven't watched it yet, but we're getting more fanboy about the game by the week, so you should do too, obviously. Download it here.