I have a two-tier system. Impressive-looking books in the front, where people can see them and be impressed by how smart I am. Richard Layman horror novels and collection of old Alpha Flight comic books in the back, so nobody has to know.
The same system I use with my DVDs. The Tin Drum and Olympia in front; Return of the Living Dead, Reanimator, and huge collection of Lucio Fulci movies in the back.