One thing that I think that authors should try to do is partner with illustrators and offer free awesome illustrations in the ebook (that would be expensive to print) and then the illustrator could offer a range of repros and extra illustrations for sale as premium items. With the right product line, this could be a lucrative partnership that also gave the ebook an edge over other ebooks in the same genre.

Yes! For the book I’m working on right now, I’d like to partner with another author to write the poetry my character writes. She would have credit and a percentage and I’d get good lyrics I can’t write and don’t care to.

The same set up might work with a good photographer — although people tend to be more resistant to paying for photography than for illustrations.