Alright, I'm confused, and maybe someone can help me out here. I just watched the episode "Doomsday" in which Rose supposedly dies (metaphorically?) in the sense that she's separated from the Doctor when she's saved from falling into the Void by her dad-from-another-dimension who takes her to that dimension. It was obviously supposed to be all emotional, but - er - isn't the exact point of having the TARDIS to allow the Doctor to zip right on over to that other dimension? I mean, they were already there a few episodes ago. What's the problem?
Oh right, did I forget to mention spoiler alert?