Call of Duty:Official site. Includes trailer, wallpapers, features and fan-site links for each game.
Call Of Duty Boards: A forum offering discussion, support, downloads, modifications, and customization information.
Call of Duty.co.uk: Forums for current and future games, includes game and server administration tips.
CoD Files: Offers downloads as well as discussion forums and screen shots.
FilePlanet: Patches, demos, trailers, and gameplay videos.
Planet Call of Duty: Offers picture of the day, patches, news, discussion forums, clan directory, servers, mods, downloads, cheats, guides, and FAQs.
Pure CoD UK: Includes support/discussion forums and a Java chatroom. Maps, mods, and tools available to registered users.