It's a TV show broadcast by Fox a few years ago. It was on for less than one season before it was canceled.
Basicly, it's the wild, wild, west in space. The character development is terrific, the stories are super, and the acting is pretty good. It's a Joss Whedon, who also did Buffy and some other things. I've never seen anything else he's done, but I hear it's good.
Fox butchered the show by showing the series out of order, and pre-empting it for weeks at a time. The show was canceled before all the episodes filmed were shown.
A DVD was released that had all the shows, in order, and some interviews. The overwhelming sales of the DVD prompted the creation of the movie, which will, hopefully, resurrect the series. Ironic.
More information:
http://www.fireflymovie.com/intro.html
http://www.imdb.com/title/tt0303461/
http://www.amazon.com/exec/obidos/tg/detail/-/B0000AQS0F/ref=pd_sxp_f/002-9407214-3367256?v=glance&s=dvd
http://www.fireflymovie.com/reviews.html
Check it out!