Game Design

No Place Like Home
Works of interactive fiction created using Inform and an exercise in implementing the same game in different systems.
http://www.firthworks.com/roger/cloak/index.html

Object Oriented Games
Essay by David Librik on the design of a new object-oriented system for adventure games
http://www-cs-students.stanford.edu/~amitp/Articles/ObjectOrientedGames.html

XYZZYnews: The Art of the Puzzle
Three accomplished IF authors discuss the art of creating puzzles for a game.
http://www.xyzzynews.com/xyzzy.14g.html