I just finished the series last week. What a tearjerker finally. That had to be one of the best story arc series ever produced.
Season 5 used to be my least favorite, but now after re-watching the entire series, season 5 has some of the best moments in the shows entire run.
I could never get into the stand alone story projects, such as the TNT films and lost tales video. Yet, I did like the re-edit of the Pilot and parts of "In The Beginning".