Seems like everybody wants in on the book publishing action, even little old Amazon. But this article on Amazon Publishing may pull the covers back further on their latest foray in to consolidating the book industry than they'd like: http://tinyurl.com/4ykrzsj
I'm kind of ambivalent on this. As a publisher, I have to deal with Amazon whether I like it or not. As an author, I have to deal with Amazon whether I like it or not. As a consumer, I buy from them all the time without blinking. The monolith that is Amazon has been good for authors in many ways, opening up avenues for self promotion and having books listed whether they are best sellers or not.
But Amazon's encroaching control over book production, distribution, pricing, and copyright issues should be something to think about and pay attention to, not that we (small presses and their authors) could stop them if we wanted to.