It's how she is not dead. There is no way she could have survied what happened to her, so something big must have happened to "bring her back." And actually she is the first one to turn up not to be dead. Up till this point every majoe character that died has stayed dead. That's why I was so sure she was gone for good. Even though this is a Sci-Fi show there arn't too many quick fixes like on most of these. When you're dead, you are dead. Billy is dead...Ellen is dead...Kat is dead. Crashdown is dead. On BSG you stay dead (If you are human.)...until now that is.
Course this also might be all in Lee's head and she is still very much dead, and he has gone crazy from all the shit that's gone down. I mean Starbuck died, he lost his postion as CAG, and the with Military in general, and he found himself defending Gaius Baltar at trail which put him at odds with his father who he has never got along with. And only Lee saw her, so he could have just snapped. Wouldn't be the first time. He gave up and was just going to let himself die in early episode, but they saved him at the last moment. So he hasn't been the model of sanity.
There this is the possiblity that Starbuck is in fact a Cylon. Up till this point the only people able to come back from being dead where Cylons. She didn't show up till the Cylons where attacking. These Cylons arn't suppose to know who the final five are though, there was some kind of rift or something between them and none of them even know what they look liked. In fact D'Anna (Lucy Lawless) actually died trying to find out who they were. The only Cylon to date that died and stayed dead, but only cause the others took her offline. So I doubt if she was she came from those ships. Won't know till 2008.
I'm also not as sure that Chief, Sam, Tigh, and The presidents assistant (I can't remember her name.) are Cylons as I was last night. The song they all heard was a Jimi Hendrix tune (Watchtower to be exact.). Which could mean they wre close enough to earth to recvive radio signals, but why these four only heard it I have no clue.
One thing I'm more sure of now then I have ever been is that Roslyn is a Clyon. She had a shared dream with Sharon and Caprica six...both Cylons. The only one that had the dream that wasn't a confrimed Cylon was Rosyln. I've actually had her pegged as one from Season 1, and this just adds fuel to that fire.