#bookshelf? I’m terrible at opening analogue books, but when I do it is usually Essential Mathematics For Games & Interactive Applications (Van Verth).
I also really enjoyed The Writers Journey (Vogler).
By far my greatest source of nonfiction reading is a ton of articles and whitepapers on my Instapaper account.
Highest traffic reading is sci-fi from iBooks and stuff from ComiXology.
Game development! Discussions about game development and related fields, and/or by game developers and related professions.