I don't know if I'm the only one, but I'm going to throw this out there: in Season 1 I guessed they were in purgatory or hell. Either way, that they were dead. I'm sure there were thousands of people guessing this but it makes me feel good that I was kind of, sort of, at least close.
Now we're getting somewhere. And it is somewhat fitting that Locke, whoever he is, is the one who stars in the episode where we finally see progress in this, the final season. As much as I didn't mind last week's episode, in hindsight we didn't really get anywhere. Perhaps inadvertently making up for this, tonight's episode was pretty great.