Here was a spoiler from spoilerfix.com, concerning Desmond, in the first episode. It was posted on Aug. 31st, and now it suddenly makes a lot more sense.
Dont worry, it doesnt say how he got there or why he's there. Just his background.
Click to see Spoiler:
Edit: Something got me to thinking. In season 1, every show took place basically in the span of a day. With tonight's ep, the timespan was what, 2, 3 hours?