If people have never watched this before, they really need to.
It's a great, fun show filled with top notch writing and characters. The acting is great, the stories are fun and clever and the universe of the show is vast and diverse.
It's a real shame this series didnt' go on. It's definitely better than the most recent Joss Whedon show, Dollhouse.
Anyway, highest recommendation. My wife's watching this again while she's painting her pewter miniatures (one of her hobbies), and I sat down and took in a few eps with her. Good times.
Buffy, Angel, Firefly...man, Whedon did some good stuff back in the day.