I also don't understand the point of the Jack gets married backstory.
I took this very differently than some of you. Since he was flashing back to the wedding pre-amputation -- and then actually went through with the ceremony, which was the last we saw of his "wife" in flashback -- I thought him giving in to Boone's demands to let him die proved that he *hadn't* learned to give up previously.
We don't know anything about his wife, she's never been mentioned till now (i.e. he's never told anyone on the island about her), which leads me to believe that something didn't work out there. Meaning, maybe he knows now that he *should have* given up on the marriage beforehand, and he was drawing on that when he chose not to keep trying to save Boone.
her toast, it kind of creeped me out that she didn't say one single word about liking/loving whatever
Yes, this. It came across as complete hero worship to me, that whole "doctor as god" thing, not romantic love.
Also, I agree with Cashmere -- when you're really in the throes of delivering a baby, it could be televised on national TV and you wouldn't care. Asking Kate to do it probably stemmed from Jack, misguidedly or not, trusting Kate to handle it effectively. Charlie might fall apart, since he loves her, Hurley faints at the sight of blood, Jin doesn't speak English, etc. The only other choice was Sun, and I think he knew he needed her at that point.
And Jack's "Locke murdered him" pronouncement was completely over the top, at least if he's actually thinking with malice aforethought. Locke could have slit his throat quite effectively, which Jack should know, and he did carry him in to camp, asking for help. Jack feeling like Locke got Boone into something he shouldn't have is maybe reasonable, but it's still not murder. Seems a little disappointing as the tipping point for the battle, if that's what it's going to be, between Jack and Locke to begin.
We better find out what the glowy light is soon. That was intriguing.