After several years of false starts, the universe of digital books seems at last poised to expand dramatically. Readers should view this expansion with both excitement and wariness. Excitement because digital books could revolutionize reading, making more books more findable and more accessible to more people in more ways than ever before. Wariness because the various entities that will help make this digital book revolution possible may not always respect the rights and expectations that readers, authors, booksellers and librarians built up, and defended, over generations of experience with physical books. As new digital book tools and services roll out, readers need to be able to evaluate not only the cool features they offer, but also whether they extend (or hamper) one's rights and expectations. This paper provides a checklist that can help guide a reader's inquiry, as well as an extended explanation of why the answers to these questions matter. (Contains 26 endnotes.)