Those of you interested in learning more about Follett and Overdrive should take a look at the recent Off The Shelf column in Booklist Online - E-book Distributors for the Public and School Library Markets. The article provides an overview of the content, features, and business models of both of these distributors.
NetLibrary, due to it’s recent transformation, has a feature article in the Nov. 1, 2008 Booklist issue (and Booklist Online)
Academic aggregators - ebrary, EBL, and Myilibrary – were featured back in May, 2008.
All articles are linked from No Shelf Required, just check out the articles link.