So what would your characters read? I am assuming your fictional world is a literate one. I mentioned legends and myths in a recent post but what would be the popular books in your fictional world? What books would the government/ruling authorities seek to control or ban? What would the libraries (or equivalent) stock, presumably on said government's orders?
Do your characters read for pleasure or prefer to take in their stories via film or other media? What would be the most popular type of book in your world and why? (And are the authors better paid than here?!).