Sublime
An inspiration engine for ideas
This is where role-playing games become role-playing economies.
Chris Rempel • Part 2: creating the new frontier – Chris Rempel's Blog

Play finite games, win finite prizes
Emmett Shear • Tweet
Games that fail to exercise the brain become boring.
Raph Koster • Theory of Fun for Game Design

The Rise of Virtual Communities: In Conversation with Virtual World Pioneers
amazon.com
As we learn more patterns, more novelty is needed to make a game attractive.
Raph Koster • Theory of Fun for Game Design
The definition of a good game is therefore “one that teaches everything it has to offer before the player stops playing.”
Raph Koster • Theory of Fun for Game Design
the more rigidly constructed your game is, the more limited it will be.