KILBY!
GIBBY!
GOLDY!
Hey mountaindud... What Up?  :lol:
I vote Kilby.  Although Conan is a very close second.  Conan provided more overall laughs, but Kilby provides just as many, and he's a great interviewer.  Much better than the other three.  Besides, he's got Goldy and Gibby as well!  :lol:  Look at all the stuff Kilby does as well:
Recreation of a Press Photo
What Up?
To _____ with Love
Sebastian, The Asexual Icon
And of course, all the little things they throw in after In The News.
Also, 5 Questions has to be one of the greatest things to ever happen to a late night talk show.
Another thing, is that Craigers gets the "nobody" guests.  The people I've never heard of, so they get more recognition and all.
Craigers > ALL!
Leno is boring (although I due enjoy Headlines).  I don't even watch Letterman.
BTW, Conan is spelled O'Brien.
Conan isn't that great of an interviewer, but he's provides more comedy.  I love the interviews he does with the celebritys via satellite.  :lol:
Also, who doesn't love it when Frankenstein Wastes a Minute of our Time?  :lol:
And of course, (more recently anyway), The Walker Texas Ranger Lever!  

  :cheers  :thumbs-up:
I've been watching them all for about five years now, and Kilby and Conan are by far the best!  :thumbs-up: