According to this MTV piece, Batman: Arkham Asylum features a death-saving mechanic along the lines of Prince of Persia’s ever-present female hand.
Apparently, if you fall off a ledge onto some spikes, or what have you, the game slows down and prompts you to hit a button to shoot out your batarang and getting back to where you were.
You can still die, however. So that’s OK.
Mopre through there. Batman: Arkham Asylum will release on August 25 in the US, and three days later in Europe.