Lost: What Kate Does Review

Summary:

Kate, Jin, and a couple of exposable others chase after Sawyer, who ditches the Temple. Kate knocks out the others and leaves Jin behind to find that Sawyer is at New Otherton, where he goes to his old home, rips up some planks in the floor, and reveals he was going to propose to Juliet. After an amazingly acted scene, he throws the ring in the ocean, leaving it (and Kate) behind. Later, Jin is recaught by the others, who are about to kill him when they are shot by... Claire!
Sayid is alive again, and Dogen is suspicious, so he tortures Sayid, trying to diagnose him. The Others think he fails the test, and try to get Jack to unwittingly poison Sayid. When that fails, they reveal that Sayid is infected, and will become Evil? When Jack asks how they know that, they respond that it's the same thing that happened to his sister.
And in Alt World, Kate dumps Claire on the side of the road, and then has guilty feelings about it when she finds a stuffed animal in Claire's bag. She picks Claire back up, drives her to the Adopting Parents, who totally ditch her, and then brings Claire to the hospital to deliver the baby. Ethan (!) is the attending physician, and it turns out to be a false alarm. Kate and Claire part ways.

Reaction:
Claire is back! Okay, so I totally knew that was going to happen, but the reveal that she's infected too was crazy. Also, I'm loving that Claire 2.0 = Rousseau!
Jack is finally taking a stand and asking questions. Sayid may be possessed. Hurley and Miles continue to be the best onscreen duo ever.
Best line of the night: Miles, to resurrected Sayid: "As you can see, Hurley has assumed leadership responsibilities, which is awesome."

Themes:
Too early to say. Continued the theme of Kate and Claire's friendship, and the concern about who would raise Aaron. Oh yeah, leadership is a big theme - Jack and Dogen's conversation about why Dogen needs a translator is great, and has all sorts of practical application.

Speculation:
Next week, Locke and Sawyer? Fake Locke? Awesome. If it's about Locke, then are we following a repeat of the order of focus of Season 1 episodes? All / All / Kate / Locke / Jack / etc... So far we have All / All / Kate / and Locke next week? So then are we looking at Locke / Jack / Sun / CHARLIE?
Sayid and Claire as Fake Locke's evil minions... That could be freaking awesome, if Claire is as good at shooting people as she looked in this episode.
Can't wait to see what's next.