Well I havent really seen this mentioned so here it goes.
When Zoey gives MIB the walkey talkey and he then stares at it for a while, finally crushing it with the wooden stick. Now from what ive heard people are passing this off as Locke considering his options, and then destroying the walkey talkie to show that he isnt making any deals. While this could be true, here are my thoughts. You have a guy who doesnt seem like hes seen technology in over 200 years. He's given modern technology and looks at it trying to figure out what it is. After a while he decides he doesnt like it, as with new technology altogether. So he destroys it. Does this sound familiar?? When Ben takes Locke to Jacob's cabin, he tells him to use the lantern because "Jacob" doesnt like technology. When Locke shines the flashflight "Jacob" loses it and tries to destroy it. I think this is a great hint as to the fact that MIB was in jacob's cabin.
My second thought has to do with Jack. Let me start off by saying that I have loved Jack's character since season 1, apparently unlike every other LOST fan. Well my thought has to do with the fact that a lot of people are finally getting around to Jack, as he is becoming a much more rational person. I'm sorry but Jack is not acting rational, but just as extreme as before. Jumping off boats to stay on the island, and lighting dynamite are just as crazy as his past ideas. The only difference is that now he's doing it based off of faith. Jack has went from one end of the extreme scale to the opposite end.
Those are my thoughts, what do you guys think?