Game Revolution
All the help you need for your all systems games:
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http://www.game-revolution.com/games/codes/codes.htm
Cheating Planet
Gamespy cheats is the most complete source for video game cheat codes, walkthroughs, cheats, codes, faqs, and hints.
http://www.cheatingplanet.com/
Cheat Code Central
The best place anywhere to get cheats, codes, and cheat codes! we get the new cheats and codes first for all ps2, xbox 360, ps3, wii, xbox, gcn, pc, ds, psp, and gba games! we add brand new codes daily and have hundreds of thousands of cheat codes, hints, tips, passwords, secrets, faqs, and tons more for the playstation 2, xbox 360, playstation 3, nintendo wii, xbox, gamecube, pc, ds, psp, game boy advance, psone, sega dreamcast, game boy, nintendo 64, dvd.
http://www.cheatcc.com/noframes.html
Game Winners
Codes, hints, and walkthoughs for dos/windows, gamecube, xbox, playstation2, nintendo 64, playstation, saturn, 3do, jaguar, snes, genesis, portable, and classic systems.
http://www.gamewinners.com/noframes.htm
Happy-Puppy
Happy-Puppy
http://www.happypuppy.com/
MegaGames
Megagames cheat codes, one of the largest archives of cheat codes and walkthroughs for pc, dreamcast, playstation, gameboy, nintendo 64
http://www.megagames.com/consolecheats.html
IGN Codes
Ign cheats is the ultimate resource for video game cheats, codes, walkthroughs, guides, cheat codes, faqs, and hints - updated daily with the largest selection!
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Supercheats
Massive cheat code collection for playstation 2, ps3, xbox, xbox 360 playstation, nintendo ds, gameboy advance, gameboy and pc systems
http://www.supercheats.com/