Anti-Cheating

PunkBuster - Anti-cheat software incorporated in some of the more popular online, multiplayer shooters, including the Battlefield series.
http://www.punkbuster.com/

PBBans - Offers a "Master Ban Index" among networked game servers.
http://www.pbbans.com

Wikipedia: Valve Anti-Cheat - Encyclopedia article covering anti-cheat measures used in Counter-Strike, Half-Life Multiplayer, and other games distributed on Valve's Steam platform.
http://en.wikipedia.org/wiki/Valve_Anti-Cheat

DMW - Third-party anti-cheat software originally developed for "Medal of Honor: Allied Assault" and expanded to protect other games.
http://www.dmwworld.com/

Respected Admins - System administrator community dedicated to anti-cheating with a focus on Punkbuster supported games.
http://www.respectedadmins.com

Wikipedia: Category:Anti-cheat software - Collection of articles on different anti-cheat software packages.
http://en.wikipedia.org/wiki/Category:Anti-cheat_software

SecurePlay - Offers programming libraries to incorporate anti-cheat measures which work even if the source code is compromised.
http://www.secureplay.com/

Wikipedia: Cheating in online games - Encyclopedia article covering types of cheats, implementations, and prevention methods.
http://en.wikipedia.org/wiki/Cheating_in_online_games

Wikipedia: GameGuard - Encyclopedia article covering the software, including criticisms.
http://en.wikipedia.org/wiki/GameGuard

PunksBusted - Anti-cheat organization, supporting all PunkBuster enabled games. Home of the Auto-MBL, a large scale ban list system with thousands of member servers. Forums available in English, German, and French.
http://www.punksbusted.com/

AntiCheat Inc - Battlefield 2142 and America's Army system administrator anti-cheat community.
http://www.anticheatinc.net/forums/portal.php

GameGuard - Anti-cheat software from INCA Internet.
http://eng.nprotect.com/nprotect_gameguard.htm

PlayNoEvil - Weblog focusing on game security and on the farming and sale of game valuables in online RPGs. Partial focus on Asia.
http://www.playnoevil.com/

Cheat Police - Register for free to get anti-cheat software and bust them cheaters!
http://www.thecheatpolice.com/

ComputerAndVideoGames.com: Trick or Cheat - Article on the problem of cheating in multiplayer games and what is being done to combat it. <small>(August 4, 2006)</small>
http://www.computerandvideogames.com/article.php?id=143973

BBC News - Coverage of Valve Anti-Cheat (VAC) in Counter-Strike. <small>(August 29, 2002)</small>
http://news.bbc.co.uk/2/hi/technology/2221335.stm

Counter Hack - Wiki offering resources to combat cheating in multiple games.
http://wiki.counter-hack.net/