X-link to the DRM-free thread for two new bundles:
StoryBundle's
The Bump in the Night Thriller Bundle is curated by Kevin J. Anderson and mostly features titles from his own WordFire Press, including some backlist such as a 1996 Dell novel from Kristine Kathryn Rusch.
Humble Book Bundle Fandom & Philosophy presented by Wiley Blackwell contains meta non-fiction exploring the philosophies of popular mostly sfnal (but some music and other) franchises including Star Trek, Star Wars, The Hobbit, Game of Thrones, Battlestar Galactica, and more, if you're interested.