This article at Fast Company is more about Adam Corolla and podcasting than radio but this bit sort of jumps out at you:

“Radio has a lot of rules that are set up to protect the foibles and weaknesses of the host.” He names names: “Mark and Brian, Opie and Anthony are, like all radio guys, comedically second tier. I’m not putting these guys down; I’m in that group.” But you’re not going to find a Jon Stewart, a Stephen Colbert, or even a Jimmy Kimmel telling anybody the time during your morning commute. The rules enforce a sameness that eliminates any chance of something original happening. “Radio’s about guys with subpar intellects killing four goddamn hours…

As a former radio guy, I also enjoyed this:

“I’d rather have 10 smart people than a billion retards listening to me.”

I thought we couldn’t say retard.

I enjoyed Carolla when he and Jimmy Kimmel hosted The Man Show. (I think that was what it was called) I’ll sample his podcast and report back.