Sub-character designs:
http://blog.getchu.com/archives/51657777.html
Comments from various people (QP:Flapper duo, person who drew the manga, author of Kanokon, author of Mushi to Medama, etc.)
http://blog.getchu.com/archives/51657764.html
Boku ha Tomodachi ga Sukunai's author's comment on the author of MM! was...
Wow, talk about detailed.