I just sent off a notice of copyright infringement to the person in charge of ebooks on Mobilism, a pirate site. Most of my books, as well as thousands of others, are listed there. I confirmed that they offer entire books by downloading a copy of a book I had already purchased from Amazon when it first came out.
The site also directs people to blogs that apparently have no other purpose than to offer work stolen from authors.
Based on the number of ‘views’, I suspect more of my books have been stolen than sold honestly through Amazon and other sources. Amazon’s mobi files and also ePub files, the version used by Apple and others, were available.
If you’re an author, I suggest you see if your books are available on pirate sites.