(Image from ew.com. I used to hate John Locke's character but the actor who plays him, Terry O'Quinn is unbelievably talented.)

If you're an avid Lost fan you NEED to read Doc Jensen's reviews of each episode on ew.com. They may be a little too comprehensive, but he points out stuff that I wouldn't ordinarily notice, like the fact that all of the episodes so far mirror episodes in season 1.