Directory: Console Cheats

Top 3:

1. 911Cheats - Massive library of cheats for old and new games. 

2. GameFAQs - The Frequently Asked Question (FAQ) pages for some games are a great touch.

3. IGN - Codes - New codes galore.

All:

• About.com: Video Game Strategies - Offers cheat codes, hints, and FAQs.
• The Adrenaline Vault - Cheats and hints for serious gamers.
• All Consoles - Cheats, codes, and walkthroughs for all Consoles.
• Cheat Code Central - Contains many cheats and hints for console games.
• CheatPlanet.co.uk - Provides cheats for the Playstation, N64, Dreamcast, also has reviews, a games chart, gaming news, and its own search engine.
• 25000 Cheats - Over 25,000 cheats for N64, Gamecube, PSX, PS2, Xbox and Gameboy.
• 911Cheats - Contains a large collection of cheats, hints and walkthroughs for all the major platforms. 
• Cheats Club - Cheats for only major blockbusters like GTA3.
• Code Junkies - Codes for the major console systems.
• GameFAQs - Provides codes for all the major systems with daily news.
• Gamer Elite - Offers codes, cheats and hints for multiple systems.
• Happy Puppy - Loaded with news and cheats for tons of games.
• IGN - Codes - Contains many cheats and hints for console games.
• Realm of Gaming - Consists of  cheats for the GameCube, Xbox, PlayStation 2, Dreamcast, PlayStation, Nintendo 64, and Game Boy Advance.
• Super Cheats - A video gamer network site that has lots of video game cheats.
• Tipland - Cheats and related forums for a number of gaming systems.
• Ultimate Cheats - Offers cheat codes.