Civilization IV

Apolyton.net: Civ IV
News, screenshots and discussion forums covering strategy, multiplayer and democracy games.
http://civilization4.net/

The Atlas Project
Alternative random map generator software. Includes manual, downloads, screenshots and release history.
http://atlas.junuxx.net/

1 Big Community: Civilization Forums
Discussion forums covering Civilization III and IV strategy, multiplayer and modding/customization.
http://www.1bcciv.com/

Civilization Fanatics' Center: Civ IV
Discussion forums covering game strategy, customization and technical support. Also offers articles, technology tree and hall of fame.
http://www.civfanatics.com/civ4/

Civ4players Ladder League
A multiplayer fan forum for the game.
http://civ4players.proboards44.com/

GameSpot
Offers previews, news, screenshots, movies, and links.
http://www.gamespot.com/pc/strategy/civilizationiv/

GameSpy
News, previews, screenshots, and a movie.
http://pc.gamespy.com/pc/civilization-iv/

IGN
Previews, press releases, news, screenshots, and videos.
http://pc.ign.com/objects/620/620513.html

2k Games: Civilization IV
Official support site. Includes technical support FAQ, developer weblog, comparisons against previous games in the series, mods and downloads.
http://www.2kgames.com/civ4/

1UP
Preview, by Garnett Lee: "...we were convinced this new Civilization was right in line to follow in the footsteps of its older siblings." <small>(May 20, 2005)</small>
http://www.1up.com/do/previewPage?cId=3140844&did=1