1RPG.com
English and Spanish sites categorized by system.

Darkened
Tries to provide a comprehensive listing of RPG webpages, though currently lists only a few.

Rogues Alley Gamers Association
A link list of sites related to roleplaying, including different resources for GM's, LARPS, and PBEM's.

RPG Top Sites
Lists of sites categorized by system and genre, ranked by reader votes.

Legolas' RPG
Large index of Role Playing links. Also contains original content like the Stage Setting, the World of Llanowar, Legolas' RPG Fonts, and Legolas' RPG Maps.

NetRPG
Directory to netbooks, software, and other short works.

Fantasylibrary Online
Categorized gaming links and some game advice articles.

About.com: Roleplaying Games
Advice, downloads, links, and convention listings.

RPG Gateway
Large searchable directory of roleplaying game worlds, resources, link sites. Top 100 ranking, button exchange, news.

Wowee: The Roleplaying Directory
A directory of roleplaying game sites. Adds new site submissions instantly.

WebRPG Resource Archive
Collection of miniatures, character sheets, and other resources for use in WebRPG games.

RPG Kingdomcom
Provides links to RPG games.