Postmortems
The Art of Game Design - A Book of Lenses (Jesse Schell)
The Game Design Reader - A Rules of Play Anthology (Katie Salen y Eric Zimmerman)
Gamasutra (gamasutra.com)
Kongregate (kongregate.com)
ExtraCredits (extra-credits.net)
boardgamegeek.com
LevelUP - The guide to great video game design (Scott Rogers)
Designing Games - A Guide to Engineering Experiences (Tynan Sylvester)
A Theory of Fun for Game Design (Raph Koster)
Rules of Play: Game Design Fundamentals (Katie Salen y Eric Zimmerman)