Well I'm obligated to say Fosters is one, ofcourse.;) But I do love many of the themesongs from the 80's. Voltron, Transformers, Thundercats, Teenage Mutant Ninja Turtles and so on.
Whene it comes to modern ones, I am partial to most of the ones from Inuyasha and Full Metal Alchemist.

Mighty Morphin Power rangers had one of the BEST Tv theme songs ever, one of THE BEST! I absolutely love it, it's super catchy and the updated movie version of it was even better. Ben 10 also has a very addictive opening theme song.

I like Foster's but, I honestly have found others I liked more. I also love these TV theme songs:

Buffy the vampire slayer
Big Bad Beetleborgs
Darkwing Duck
Sonic X
Sonic the hedgehog (SATam)
Smallville
Godzilla: The series
The Animorphs (KICK ASS theme song)

Ben 10 (Even though I hate that show)
Foster's Home For Imaginary Friends (of course)
Recess (it's so catchy)
Drake and Josh
Neds Declassified School survival guide (that is an awesome theme tune)

And I think thats about it. When Ever Ben 10 comes on I sit and watch until the theme tune is over and then run off XD

I always loved the Gargoyles theme song. And the Earth Worm Jim theme song was always fun!

The Simpsons
Invader Zim
Foster's
Malcolm In The Middle

Of course Foster's. And why hasn't anyone mentioned the South Park theme yet? :macwor:

Two words equal one of the greatest TV theme songs ever!

:cheese: Inspector Gadget.

This is both for shows I like and shows I don't care for (and some shows I never saw):

The A-Team
Battlestar Galactica (the original series)
Danger Mouse
Dr. Who
The Flash (awful series, awesome theme)
Futurama
Get Smart
The Green Hornet
Hawaii Five-O
Hill Street Blues
Johnny Quest (original)
Mission Impossible
The Muppet Show
Peter Gunn
Secret Agent
Star Blazers
Star Trek: The Next Generation
Twilight Zone (original)
The X-Files

Sorry there's nothing current in there. I don't watch much TV anymore.

You're not missing anything. :(

The Office, Foster's, Rugrats