if:book has a very interesting article on print on demand, networked books and the reader as editor.
Here

The above link makes reference to an article in the NYT which as ever with the Times falls a little short of satisfaction.
Here

If you have heard the buzz around The Long Tail by Chris Anderson then these two posts and a guardian article (I know five links in a links post, shocking) will give some interesting detail and tangential thought.
Here,
Here
&
Here