I always marvel at David Letterman's show and how well he handles guests, topics and even controversy - and it's also a very funny and entertaining show. Often when meeting with morning shows examples pop up from Letterman's show that really help the talent see how to entertain the audience.
I was watching recently and Dave had on the Sports Illustrated swimsuit issue cover model. Dave managed to turn the segment into a pretty sexy moment on the show, but he didn't even get close to being crude, un classy or to risque for the mass audience. Take a look at the segment that covers a lot of topics that we often hear (or heard) on shows like Stern but watch how Dave manages the territory:
Instead of making it shocking - he makes it funny yet still titillating.
Also wanted to pass on a piece from Jaye Albright's excellent Breakfast Blog. Jaye consults mostly country stations and had a great piece on a recent Deloitte and Touche study on the media usage from the 4 big generations. It's clearly worth the read -