For cover art:
Matthew Revezzo Designs
For budding writers:
Kris Writes/The Business Rusch
Kris Writes/The Publishing series
Ms. Rusch has quite a few great articles on her site. I'd recommend too many to list here. :)
The Writings and Opinions of Dean Wesley Smith
National Novel Writing Month
or their summer Camp NanoWrimo if you want to start now.
For Ebook formatting tips:
All contents copyright Juli D. Revezzo, 2000-2016.