I saw Serenity last night. What a great movie. I won't say more, for those of you who haven't yet seen it, other than to say, Go fucking see the movie!
Great quote from the Serenity Official Visual Companion, out of a couple paragraphs from Nathan Fillion:

I remember when Joss called me, back when he'd just written the movie. He said, "I'm done, I'm done, I finished." I said, "Read me the first line and the last line." He goes, "Okay, the first line is, 'Earth-That-Was.' And the last line is, 'Wow, sure was weird the way Mal died in the first act.'"