David Letterman is the Phil Connors of late night TV. Every show is the same.
Did anyone watch Letterman to see if they gave a tribute to Bud? I would hope so, but I do not watch it unless there is someone on that I really want to see. His guests even suck, but that is probably because Dave sucks doing interviews. I know that most of what you see dave doing, the interview, is all scripted, with leading questions and what-not, not off-the-cuff like you would like it to be.
I hope Dave did/does pay tribute.