From the article intro: "Ebook sales will be $9.7 billion in 2016, more than three times this year’s $3.2 billion in sales, according to a recent report by Juniper Research.
Online publishers and ebook distributors offer a growing opportunity to authors and small publishers, as well as affiliate marketers.
Here is a list of ebook publishing resources. There are mainstream ebook stores, as well as ebook aggregators, which provide a gateway to retailers.
Aggregators may offer additional services besides distribution, such as design, formatting, and marketing."