I had heard and i have no idea how true it is is that it all revolves around Hurley, Walt and Locke? Who know i dont even think that the writers really know and make it up as they go along! In the first series there was a lot of attention to the weird sounds and monsters and that odd black floating smoke thing that appeared in front of one of the characters but in the second series they seem to have dropped all of that!! Most odd and frustrating but addictive at the same time!! Roll on series three!