Ridiculously awesome episode tonight- the last 3 have all been back to Season 1 quality.
Spoilers below for those on the West Coast or those who Tivo'd it. Scroll down.
I think that Sun was most likely artificially inseminated when she was captured briefly by the Others. The flashback to her capture on the "Previously on Lost" sequence at the beginning gives that away. I probably wouldn't have considered that if not for that segment, and I wish they wouldn't have put that in there. That makes the most sense as to why they let her go. I wonder if the baby will be some type of Rosemary's Baby- type freak?
Probably not, and it most likely will end up as a normal baby that has been infected.
Also, I KNEW that the map would be a trap. The Others probably had some type of plan/story drawn up in case any of them ever were captured. That's why the guy could keep all of his facts straight- he had memorized them in case of capture.