Ginger pointed out this intensely interesting story from the science news. Looks like teleportation could become a reality. Now - the argument really is: if you're molecules are killed and reassembled in the same spot, is it truly you or just a copy of you? Does your consciousness come with you? Do you revert to some cellular memory or are you a completely new person? Could you come back as the evil you - like the evil Captain Kirk? (By the way, I didn't come up with these questions - these were from Hodstaffer I think...)
Oh - and don't get me started on "the Fly" scenarios either... In any case, I think this technology is probably going to be used for mundane things (like JCrew sending the color you really wanted in real time). Yay retail.