Let's see... let me try to recap what was revealed:
1) The Others ARE a former part of Dharma, and they lived in a quasi-normal community on the island until the plane crashed.
2) One of the reasons Jack is so screwed up is that his paranoia led his father to jump off the wagon and eventually die.
3) The Others are very, very aware of every minute detail of the Losties' lives off of the island.
I'll add more later, but I have a meeting to go to now.
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