Near the genesis of most podcasting (in my opinion, given the age of it which was around mid-2005) is by a bestselling science fiction author Michael Stackpole called "The Secrets"
Although it has long since been retired, and replaced by "The Dragon Page: Cover to Cover", you can still access most of the archives and gain much valuable information in regards to writing, including the predicted rise of epublishing.
Unfortunately, it has been a while since Michael Stackpole (and his co-host Michael Mennenga) have released a podcast, you can still download most of the shows--I have, and have gained a great insight into epublishing and how one can take advantage of it.
So, in this blog, you get two in one:
Michael Stackpole's "The Secrets"
Dragon Page: Cover to Cover