FYI: The Firefly series is available on Netflix.
I am in the process of watching the Firefly series now, and have seen the movie. I really liked the movie (enough to buy it on DVD), and was very pleasantly surprised to find the TV series almost identical. The same actors, writer, director, and I think special effects people, as well, possibly, as costume and lighting people, etc. The style was the same as the movie, as was the message and the look and feel (although the TV series might have a slightly more "Western" bent). The episodes were probably am hour long on TV, because each episode is ~45 minutes (there are no commercials), except the pilot episode which was called "Serenity" and was about twice as long.
Both Firefly and Serenity: good stuff!
I hope they make more movies, although I find it interesting that...
SPOILER ALERT
...the movie "Serenity" killed off 2 of the characters from the TV show.