CONAN!!!! I used to like Letterman, and Leno was always alright, but they've both lost their edge. The Daily Show went to crap after 9/11, and it's never recovered (except for the very funny Louis Black). They're all just unispired and unfunny now. Conan is the last really funny show on late night.
I wasn't a really big fan of Conan until I turned away from the others. Conan is very inventive and funny! I can't believe the ideas they keep coming up with. A country hayride hodown with Mr. T, Fabio's celebrity confessional ("I really didn't think it tasted ANYTHING like butter"), the list goes on and on. I think one of my favorites was when he was about to get a new set. He didn't know what to do with the old set, so he murdered it one night. It was hilarious. He smothered the wall with a pillow, shot the chair in the back, and stabbed the sofa as it tried to run away. I've almost never laughed that hard.