Styles of Roleplaying
John H. Kim's rec.games.frp.advocacy FAQ, dealing with abstract (no one system) and RPG classification issues.
http://www.darkshire.net/~jhkim/rpg/theory/

Roleplay.org
Introduction, articles and a continuing discussion on the genres of roleplaying.
http://www.roleplay.org/

RPG Portal from Japan
Information about tabeltop roleplaying in Japan.
http://www.trpg.net/en/

Tesarta Online Gamer's Resource Library
A constantly growing collection of articles and documents created by the staff of Tesarta as well as links to other parts of the Web and books at Amazon.com, all covering a wide range of topics of interest to roleplayers.
http://www.tesarta.com/

Uncle Figgy's Realm
A writer's advice on roleplaying. Home of the popular "Uncle Figgy's Guides": "Guide to Good GameMastering" - How to manipulate friends and influence people; "Guide to Good RolePlaying" - How to make your minor deity earn his pay.
http://members.aol.com/dwcope/start.html

RPG Wiz
Reviews of roleplaying games.
http://www.rpgwiz.com/

Tastes Like Phoenix
Articles, contests, a gallery, and game supplements.
http://www.tasteslikephoenix.com/

uk.games.roleplay Frequently Asked Questions
Hypertext version of the uk.games.roleplay newsgroup FAQ.
http://www.pick.ucam.org/rpgfaq.html

World Builders Guild
Creators and manufacturers of d20 game and miniature accessories for various role-playing gaming worlds.
http://www.worldbuildersguild.com

RPG Gazette
The latest industry news for the roleplaying community.
http://www.rpggazette.com/