As I mentioned earlier, I saw Serenity. For those of your that haven’t seen it, (and you must), the first 9 minutes of the movie are online.This lays out the setting and back story of the movie. More background info can be found on Serenity’s Wikipedia entry.
Also here is a good article/essay about the philosophy behind Firefly/Serenity… Out to the Black
The existentialist libertarianism of Joss Whedon’s space western