Yeah. It's an ok film, not a great one, taken as a standalone; it only really shines, as you say, if you've already seen most of Firefly. I have a friend who mentioned he was interested in seeing Serenity; I promptly loaned him my Firefly DVDs, with the words, "Watch this first."

We may yet see more of that universe; it depends, to a large extent, on how well Serenity does in DVD sales. I'm pretty sure that that was what Universal was planning on from the start; at least, I hope so, given that it didn't make all its money back at the box office, as far as I can tell.

Grenade?