TV stations have canceled a lot of good shows over the decades before their time, but I've never seen as much of a grudge held against a TV station as viewers did toward Fox for canceling Firefly. Never mind that Fox canceled a number of other good shows as well (Futurama, Family Guy, etc.): it seems like canceling Firefly was the move that classified Fox as THE station unfriendly to science fiction.
So what is it about Firefly that makes it different from so many other canceled shows? Why do the fans of this show seem more rabid compared to so many other fan bases?