I gotta say my all time favorite is the theme to “Greatest American Hero”. Close seconds:
Gary Shandling Show
Cheers
Patty Duke Show
What’s yours?
DaLovin’Dj
Murphy Brown
Max Headroom
Samurai Jack (the original feature-length episode)
Batman - The Animated Series
Roar (anyone else remember the pseudo-Irish Herc/Xena ripoff? Show sucked but the music was incredible.)
The Lone Ranger
The Rifleman
Mission: Impossible
Perry Mason
“Believe it or not, George isn’t at home.
Please leave a message at the beep.
I must be out, or I’d pick up the phone.
Where could I be?
Believe it or not, I’m not home.”
Hmm. Probably “The Jeffersons.” 
A theme song that is actually fun to listen to!
But some second place ones:
Tales from the Crypt
Powerpuff Girls
Barney Miller
Good Times
I also always liked Night Court’s catchy little bass riff.
Same answer I always give when this question comes up: The Rockford Files.
Runner Up: Love is All Around, from the Mary Tyler Moore Show. If it’s good enough for Hüsker Dü, it’s good enough for me.
I’ll admit it. I love the theme song from That 70’s Show.
So many themes, so little space . . .
Have Gun–Will Travel
Twilight Zone
Alfred Hitchcock Presents
Dr. Who
Flintstones. Meet the Flintstones…
Now get THAT outta yer hedz!
The Sopranos!
Ishould have listed the A-tem too. That one is so much fun.
DaLovin’Dj
I’m with Andros.
Dr Who.
As a cranky afterthought. It would sound great on bagpipes too.
Davy, Da-a-a-a-a-a-vy Crockett, King of the Wild Frontier!
Runner up: The Addams Family
Lost in Space.
Greastest American Hero… of course.
I mean who could it be? It’s just fucking me!
With the A team as a close second and the Simpsons a close third. With Twin Peaks as numbah 4
Jesse – that mediocre sit-com that was on NBC for a few years starring {swoon} Christina Applegate.
Tell the truth, I can’t really remember exactly how it goes, but I remember thinking how catchy and mainstream it sounded for a TV theme song.
18 posts! And no mention of Hawaii Five-0???