I've started working on various help files/tutorials for Feedbooks too:
http://www.feedbooks.com/help/publishing
Still a work in progress but I'll have everything ready before the end of the month: in November it's NaNoWriMo and I'd like to provide an easy way for any person that participates to publish and distribute their work as an e-book if they'd like.
All of this self-published books are now available directly inside Stanza in our "Original Books" catalog, and the most popular english ones are in the Kindle Guide too. French authors have been fairly active so far and there's already a good selection of short stories:
http://www.feedbooks.com/userbooks/recent?lang=fr