The relationship between Donald and Betty Draper has hit the breaking point, in some of the strongest scenes of this powerful show. It's easy now to see that while the first season was about Donald Draper as a person, the second is more about his wife and family. Its interesting to see the changes Betty goes through, from almost pleading to be loved (or at least not hated) to refusing him to return to the house. This is another episode carried by January Jones, who has shown that the she may be the best actor on this show, and can carry the most serious of scenes.
While Donald and Betty Draper stole the show, the two other storylines brought the show back to its minor flaws. Peggy's relationship with the church and its pastor is interesting, but it has yet to bring any new development to her character. It's clear that she has turned her back on God, and can't personally tell if she wants to turn back to God yet. However, nothing really comes from it besides a few awkward Peggy scenes as she struggles with her decisions. I have also shown my dislike of Crane as a character, and one again giving him a major storyline is worrisome. However, Joan completely saves this part of the show, as she almost shows a human side of her, as she actually enjoys doing the script work, and yet is thrown aside because she is female. Like Peggy, Joan doesn't seem to want to be forced into these female stereotypes any longer, and that should make an interesting storyline coming up.
All in all, this is a classic episode and a thrilling build up to the final episodes of the second season. How Betty and Donald Draper handle these problems should be what defines the second season of Mad Men.