I loved the episode too, mainly because we finally got an answer to a long hidden mystery: How Locke got into his wheelchair. I was getting annoyed lately because there were always new questions coming, although the old ones have never been solved... And I thought Lost was getting worse... But this episode saved it all!

I think the scene were Jack tells Kate he is leaving the island was very sad, but well done. I almost cried after "But I will come back for you here."

I kind of like the smoke theory...because didn't the smoke took the form of Mr. Eko's brother, too, before it killed him?

But I think the fact Locke's father is on the island is a bit over the top...I wonder with which explanation they will come up for this one...