the show was a bit of a hit but the prob was as is for many FOX shows is that FOX screwed it up by playing the eps out of order and putting it in a time slot that got preempted by sports and things so they wrecked it without giving it a chance.
You can still see all the eps online if you look for it and there is a movie.. talk of a sequel is just that... nothing in the works...
If you dont know.. there are 2 3pt comic series out there to kinda help tie up some story and gap before the movie.
There is also this thing...
http://www.session416.com/
Which is a series of interviews with River Tam at the "academy" before she gets rescued.
This was a viral marketing thing done before the movie release.
Also there is a novel written by Stephen Brust that probably due to FOX being @sses and not letting go of the rights never got to be published... so you can get it online for free here:
http://dreamcafe.com/firefly.html
I do not know a lot about Firefly... actually only got introduced to it over the summer and I am just now watching eps and stuff... I haven't read the comics yet, or the book, but I plan to.
It is a rather catchy show... sci-fi western... reminds me of some Heinlein stories about colonizing and how it is more like the westward expansion in the US.
So no spoilers now...k?