Publishing Is Broken, We're Drowning In Indie Books--And That's A Good Thing is a fantastic article in Forbes. (From August.) It's about how self-publishing got to the point it's at now, and what might happen with it in the future.
Some interesting points made:
Self-publishing may end up being where we see mid-list authors because they can make more money there on their ten thousand to thirty thousand sales.
Also--self-publishing e-books could become the new backlist for authors. This is something I'd already heard about, and is a factor in my republishing Saving the Planet & Stuff early next year as an e-book.
The amount of marketing traditionally published authors now have to do encourages them to publish on their own--they're already taking on some of the work traditional publishers did in the past, anyway.