Publish on Amazon Kindle
A free guide to publishing your book on Kindle with Amazon's Kindle Direct Publishing (KDP). KDP is a fast and easy self-publishing tool that lets anyone upload and format their titles for sale in the Kindle Store.
The Smashwords Style Guide has helped thousands of authors produce and publish high-quality ebooks. This free guide offers simple step-by-step instructions to create and format an ebook. It's required reading for any author who wants to distribute their book via Smashwords to major ebook retailers such as the Apple iBookstore, Barnes & Noble, Sony, Kobo and Diesel. Revision: April 18, 2011
Barnes and Noble Nook epub Formatting Guidelines
Also see their simple MS Word formatting recommendation (look under last link "formatting guide").
Helpful Articles and Interviews on Formatting
How to publish your original comic books and graphic novels without going broke in the process.
Audio Interview: Publishing Articles on the Kindle and Nook
How to publish short documents for e-Readers
This free book marketing primer provides authors easy-to-implement advice on how to market their books. It starts with an overview of how Smashwords helps promote your book, and then provides 30 simple do-it-yourself marketing tips. The book is useful to all authors, even those who don't yet publish on Smashwords.