Fantasy World Building

Step-by-step tutorial for setting design, based on establishing a "world vision" for its cultural/geographic regions.
http://www.astrofantasy.com/fantasy_world/fantasy_world.htm

Timeline Generator

A web-based application that creates generic random events for a nation or region. The user can specify the starting year, number of years, and events per year.
http://www.fantasist.net/timeline.shtml

World Builder Projects

Starting place for information on how to build an imaginary setting.
http://hiddenway.tripod.com/world/

Patricia C. Wrede's Worldbuilder Questions

Advice on creating a believable fantasy world, with a particular eye toward crucial yet easily overlooked details.
http://www.io.com/~eighner/world_builder/world_builder_index.html

World Building

Contains mainly links to world design related articles and pointers to interesting sites.
http://www.hut.fi/~vesanto/world.build.html

World Builders

A website supporting a world building distance education course. Reference material, lessons, downloads, and sample worlds.
http://curriculum.calstatela.edu/courses/builders/

World Building

An example of designing a planet, from basic physical assumptions to geography to weather systems and archeological remains.
http://www.suite101.com/welcome.cfm/world_building

Guidelines For Creating Magic Systems

Compiled suggestions and discussions about the design of magic systems for roleplaying games and literature. Applicable to all genres.
http://www.hut.fi/~vesanto/link.useful/MagicHtmls/magic.html

Rich Staats' RPG / World Building Articles

Many interesting original and adapted articles of all aspects of gaming worlds, with much of interest to world builders.
http://www.geocities.com/dr_games/staats2.htm

Criar Mundos - Building Worlds

A step-by-step guide for creating original settings and incorporating realistic details. Various resources and references. In English and Portugese.
http://criarmundos.do.sapo.pt/

Magical World Builder's Guide

Suggestions for creating consistent magic themes for fantasy settings, as well as general world building advice and resources.
http://www.web-writer.net/fantasy/