My interest in time travel has come about because what if you could change the past? Save someone you loved? What kind of events would that set in motion for others. My scenario revolves around a plane crash and the idea of who's on standby to travel next, if the first person is kept from getting on. Who will die?
On an entirely different note: Watched a great special last evening on Quantum mechanics on Nova. Brian Greene really knows his stuff! Note to self, buy his book.