The The Dungeonomicon (via Treasure Tables, which also provides a table of contents linking to the sub-sections) is a giant essay/online-supplement published as a post on the Wizards of the Coast web boards which discusses the internal logic of D&D, both the game and the setting (that weird sub-genre of fantasy filled with powerful magic, adventurers and dungeons). An interesting read if you have any familiarity with D&D or games (books?) that borrow its conventions.
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