They are brilliant, they have released many albums, each one having superb songs, The song that I really like at the moment is Birdhouse in your soul If you havn't heard it yet, you should.

Any other people like They Might Be Giants?

Flood is my favorite TMBG album. ^^

There's this silly kids show on the Disney channel that they do the theme song for. They had an episode where they referenced the In the Jungle cover on Apollo 18. Pretty awesome stuff.

I don't too many of their songs, but I know I love Fish Heads. ;)

TMBG = <3

Birdhouse is also my favorite song.