So so happy it's back. Some quick notes / ideas, just to get these out of my head.
Oceanic 6: Jack, Kate, Hurley, obviously. Also Michael? Someone on Lostpedia had a theory this morning that one of the 6 could be someone who wasn't on the flight -- one of the others or maybe Desmond, and that they've nabbed the identity of one of the folks still on the island.
Jack's father in the cabin? Seriously creepy.
Re. Michael: Perrineau was in the credits as being a recurring character, so I think he's coming back soon. (I'd love it if this happened next week -- in Tim Goodman's (p)review of the season both ep1 and ep2 rated an "Oh. My. God." so I'm hopeful that Michael comes back next week.
Hurley's hallucinations are just awesome. The hand pressed up against the glass in the police station FTW.
I love that the Jack / Locke dichotomy is back -- they played it up big time in the season preview, and it was obviously a HUGE part of this episode. Man of science, man of faith.