Cheats and Hints

Active Gamer
Includes cheats for PC and console platforms including Playstation, Dreamcast and Nintendo 64.
http://www.activegamer.com/

Cheat Happens
Cheats for the PC, Playstation, PS2, Xbox, Gamecube, GBC, GBA, N64 and Dreamcast.
http://www.cheathappens.com/

Cheat Monster
PC, GameBoy Advance, Playstation 2 and Xbox cheats.
http://www.cheatmonster.pwp.blueyonder.co.uk/

Cheat Patch
Cheats for Dreamcast, Mac, PC, N64, PS2 and other systems.
http://www.cheatpatch.com/

Cheat Planet
Cheats and hints for most systems including PC, Xbox and Gamecube.
http://cheatplanet.gamesradar.com/us/cheatplanet/index.jsp

Cheat Wizard
Provides a collection of cheats for various consoles.
http://www.cheatwizard.com

CheatingPlanet
Offers cheats, codes and hints for PC, Playstation, Dreamcast, and other major consoles.
http://cheats.gamespy.com/

Cheats 2k
Hints and cheats for various game consoles.
http://www.cheats2k.net/

Cheats.ign.com
Offers a FAQ section, tips and tricks, and a buyers' guide on a variety of games.
http://cheats.ign.com/

Cheats.IT
Cheats for most consoles including Xbox, Playstation and GameCube.
http://www.cheats.it/

Computer Game Cheats
Provides cheats for a selection of PC, Dreamcast, N64, GameCube, PlayStation, and PlayStation 2 games. Also includes a mailing list, and forums.
http://www.computergamecheats.co.uk/

Edge Cheats
Cheats and reviews for most of the consoles.
http://www.edgecheats.com/

GameFAQs
Cheats and hints for PC, GameCube, Xbox and other platforms.
http://www.gamefaqs.com/

Level 80
Contains cheats, hints, and tips.
http://www.level80.co.uk/

Super Cheats
Hints and cheats for most systems including PlayStation, GameCube, Xbox, PC and Macintosh.
http://www.supercheats.com/