Gun

3D Gamers - http://www.3dgamers.com/games/gun/
Contains information, news, downloads, and screenshots.

Game Industry News - http://www.gameindustry.com/review/item.asp?id=609
Reviewed by John Breeden, score: 4½ out of 5.

GUN Headquarters - http://www.gunhq.net/
Contains news and features.

GUN.co.uk - http://www.freewebs.com/1poison1/
Fan site with character and weapon information, cheats, and chat.

Team Xbox: Gun - http://games.teamxbox.com/xbox-360/1271/GUN/
Includes news, previews, movies, and screenshots.