Americans, it seems, are either Leno or Letterman fans, much like they're either Republican or Democrat. It's an easy way to find out what kind of person you're dealing with. The answer to this Leno or Letterman question reveals a great deal about your subject.
I'm not the world's biggest Letterman fan, but as far as I'm concerned there's no question who I'd tune in to watch. It's not even close, you've got to choose Letterman. Anyone who prefers Leno to Letterman is the soulless spawn of Satan himself. He's as bland as salt-free rice cakes with water. Letterman, on the other hand, has a bit of an edge and appears to be infinitely more sincere and interesting as a human being. I don't think I could associate with someone who answers Leno to this question.
It should be said that Leno more often than not outdraws Letterman. Then again, "Arrested Development" is wrapping its second season a month early, sitting out the May sweeps (as it did last year) and, at the network's behest, produced fewer than the usual 22 episodes. The funniest show on television most likely won't see a third season. People aren't watching "Arrested Development" but stay up late for Leno's crapfest.
Shit sells but I ain't buyin'.