In the Middle East, forbidden literature is best distributed digitally. It's far easier to conceal, transmit, and even produce. There are some Arabic book clubs online that have more materials than most physical libraries. Two great examples are the atheist and Marxist communities. Neither could have thrived so much without the internet.
It's still a problem in places where the primary means of accessing the internet is the library or cyber café (which might have some sort of filtering installed). It's not all that uncommon that books popular around most of the world
are often unheard of in outlet-controlled places.
Note: Outlet control is often the holy grail of censorship (though that may be leaky as well) in that not only is content redacted, but knowledge of the content is also absent.
If you wanted to get fancy, you could probably load TrueCrypt onto a removable media to have plausible deniability via a hidden volume, or some sort of "bad password? wipe contents!" setup. However, in a country that forces you to resort to such approaches, I would bet that their human rights record is such that they wouldn't mind tossing you in jail because you were "obviously hiding something".
