Aggression: News, links, mods, forums and files.
IGN: Previews, news, game features, video features and message board.
PlanetRainbowSix: News, interviews, forum, chat, files, tactics, editing, screenshots, cheats, gear, and modifications.
r6maniac's Rainbow Six site: Cheat codes, weapons, equipment and mission information.
Rainbow Six Retreat: Features news, information, downloads and forums.
Rainbow Viper: Game information for Rainbow Six, Eagle Watch, and Rogue Spear. Also features weapons, strategies, specifications, links, and cheats.
Woody2000: News, forums and downloads. Danish and English versions.