I watch as well. And you didn't miss the two hour premiere the first time around, Fox in their great wisdom, didn't like it and didn't show it. They had the producers whip up an alternate first episode in a couple days (well, for writing anyway) and we got the train heist episode. In my opinion the train job was the weakest episode in the entire run, but the suits at Fox just loved it. Whatever. So they did finally show the original pilot, the two hour episode to which you speak, but not until after the show's fate was sown up. There are actually a couple episodes left, but it's doubtful Fox will bother to run them. The show really didn't get half a chance. Joss Whedon (of Buffy fame) got a huge production deal from Fox, Firefly was the first series under the new contract. They seem to have all this faith (at least 20th Century seemed to), give him all this money to make one of the most expensive pilots ever, tell him to go back to the drawing board. Then they give the show the worst timeslot Fox has to offer, primetime Friday night. They keep expecting another X-Files type success, but apparently they don't remember that the X-Files' ratings were never really "good" until the show moved to Sunday. So Firefly premieres with the substitute first ep, and actually gets pretty good ratings for Fox on a Friday, but there's a huge dropoff the next week, unfortunately, when the series gets a chance to put its best foot forward. Fox wonders why they're a fouth place network, well, it might have something to do with their scheduling/programming incompetence.
As it stands now Joss Whedon is shopping the show around to other networks. Maybe UPN or someone will pick it up, but it's a pretty expensive show. They're also working on getting the series on DVD, at least what's been shot.