I was thinking about this with LOST coming to an end. I'm sure fans of that show will rewatch the entire series. I agree with the OP in that I tend to watch comedies by random or favorite episodes. I was curious which entire series people tend to rewatch most often. I have watched the entire run of Boston Legal more than any other show.

For me, it's shows like Freaks and Geeks and a bunch of comedies, esp Arrested Development.

I tried to rewatch 24 a few times, but it just isn't as entertaining once you know what happens. I do plan to watch Firefly again. And if they ever release LOST in chronological order like that guy created on YouTube, I'd do that.

I'm on my third or fourth go-round with The West Wing on DVD. I also like to re-watch Third Watch, or at least what's available to re-watch so far.

I did re-watch 24 seasons one and two on DVD and liked them a second time, but I don't know if I would go for a third spin. Maybe after the show has been gone for a while.

LOST, The Shield, TSCC, Everybody Hates Chris, Invasion, Dynasty