The Best Theme Songs, I'd have to say are:

Roswell-here with me. Smallville-save me. Charmed-how soon is now. Firefly-The Ballad of Serenity. Monk-It's a jungle out there. Psych-I know, you know. Inuyasha-Change the world. Mai-Hime-Shining Days. Ouran- sakura kiss. Gilmore girls-where you lead. Dawson's creek-I don't want to wait. Reba-I'm a survivor.

And of course all the different versions of the Teen Titans theme song.