Ya know what I think would be a brilliant, and mind-numbingly-obvious, option for Podiobooks.com? The Author Feed. For example: JC Hutchins creates the 7th Son series, and I have to subscribe to three different feeds to get the series. And he announces at the end of the feed there's more stuff coming -- but I won't see it, because I'm subscribed to the feed for the last book that's already ended. So I miss the next book.
Then there's folks like me who come into a series late in the day. Suppose I do a search, having heard about "Obsidian." If I subscribe to Obsidian, I don't actually see the earlier books are there. If I subscribe to book 1, I still don't see books 2 or three, and I don't see Obsidian.
So, how about an Author feed, that works specifically like an author creating their own audio feed. First book-first chapter to last-book last-chapter. More stuff comes up, if you're still subscribed, you still get the new content.
Call me crazy -- but isn't this the obvious end to any podcast-novel production?