Apple has implemented a way for accomplished writers as well as wannabes to distribute their content on the iBookStore. I’m sure JD Salinger would despise this but it’s still a good way for anyone to get in front of a massive audience.
This service allows you to submit your books but also to set up your account to collect your remuneration from books sales.
I guess the hardest part here is not to get your book in the iBookStore, it’s to get it written…
You can check all the requirements here.