Cheats and Hints

Bosskey
Weapons, powerups, arenas, tactics, game etiquette, and overview. Covers Quake III Arena, Counter-Strike, Return to Castle Wolfenstein and Unreal Tournament 2003.
http://www.bosskey.net/

First Person Shooter Strategies
Strategies and tactics that apply to any FPS game. Camouflage, movement, hunting, tracking, sniping, teams and weapons are reviewed. Play any First Person Shooter game better by using military tactics.
http://afirstpersonshooter.tripod.com/