http://lost-tv.com/ <- this is not the official site, but it’s the most helpful in helping you figure out who the characters and things are. (I had a hard time remembering who was who…with Jack, John, Charlie, etc…B/c Jack (the doctor) used to be Charlie on another TV Series, and I kept confusing him with the Charlie (Dom Mon….dunno how to spell that) who had that same character name.
Also, I used to hate Emilie DeRavin b/c of a character she played on another series - but I decided I liked her in this one after a few episodes.