X-link to the DRM-free thread for the new Humble Bundle:
Humble Book Bundle Fandom & Philosophy presented by Wiley Blackwell contains meta non-fiction exploring the themes and reasonings behind assorted pop culture franchises. Most of them are for sfnal things like superhero comics movies and Star Trek and Star Wars, but there are also other shows like House of Cards and South Park, and music bands including Metallica and Black Sabbath.