OK, my thoughts:
I kept telling Locke to take off that darn bloody shirt. I think it kind of drove Shannon over the edge when Locke was trying to apologize to her.
Shannon was a witch to Boone and used him all of the time. I don't know why she would want to kill Locke over his death. I understand her being sad, but she never treated Boone well.
Every time there is a new episode I think it's the best one yet, but (yes, I'm going to say it) this was one of the best yet. Maybe it's because we've waited so long for a new episode but it was really well written and I am feeling the love for Sayid.
Sawyer: what can I say? I love him, the baby loves him, he's hot in funky glasses, nuff said.
Jack: He looked like crap. He must have partied the 3-4 nights prior to shooting the beginning scenes (yes, I know he was supposed to look like that)
Charlie was so cute following Sawyer around with the baby.
Regarding previews:
Walt warning Locke not to open the hatch. It didn't seem that Walt knew about the hatch (from Locke or the other survivors) so he must be having one of his "mind power" moments.
Could anyone tell what they were burning? It looked like a driver's license for a blonde woman
Michael looked ill. For those reading the spoiler thread I'll post my comments about that there.