Book Shelf
Some of my favorites for Game Design as a discipline and craft.
MDA: A Formal Approach to Game Design and Game Research, Robin Hunicke, Mark LeBlanc and Robert Zubek.
Fundamentals of Game Design, Ernest Adams and Andrew Rollings.
Rules of Play: Game Design Fundamentals, Katie Salen and Eric Zimmerman.
Game Design Workshop, Tracy Fullerton
A Theory of Fun, Raph Koster.
Creating Emotion in Games: The Craft and Art of Emotioneering, David Freeman.
Chris Crawford on Interactive Storytelling, Crawford, Chris.