We may yet get that sequel afterall. According to the linked article, DVD sales are driving the powers that be to consider making a sequel to Serenity.
A sequel would kick some serious ass, and I'm especially looking forward to it because Whedon has essentially resolved one of the major plotlines of the original. Because, in Serenity, the crew exited the film less openly wanted by the Federation, they should be freer to travel the 'Verse. Though I would imagine there will be some serious organizations after River - and Mal for that matter. There is also the very real issue of replacing the two important characters who were lost in the first film. Anyway, my point is that the sequel might be much cooler than Serenity (which is a great movie) because it is less constrained by the television show's plot and because he already introduced the characters in the first film.
I hope this happens.
Link via: Dean's World