X-link to the DRM-free thread for the new Humble Bundle:
Humble Book Bundle Forbidden Books supporting Banned Books Week contains mainly graphic novels, but there are a few non-fiction prose books (as well as non-fiction GNs), including one involving a Disney lawsuit apparently surrounding the fair use of trademarked characters in parody, and another one about hackers, both of which can be gotten at the $1 minimum tier. Two more titles at the $15 top tier cover the founder of MAD Magazine, and a history of underground comics.