Everyone's so hyped up on podcasting. Yeah, it's nice to occasionally listen to someone... but the key fact everyone seems to be missing is that you can't "skim" a podcast!
Or put another way, in an age of information overload, who the hell has time to sit and listen to a slow, drawn-out audio file? Let me skim the information, find what I need, and move on.
You're asking a lot of people to take up a big chunk of their time at your pace, preventing them from digesting the information on their own at their pace.
Ok, rant done :)