This is an excellent collection of PS2 cheat codes, cheats, guides and a whole lot more.

Details:
007 Agent Under Fire
101: Airborn Invasion of Normandy
18 Wheeler: American Pro Trucker
4x4 Evolution
A
Ace Combat 4
Ace Combat: Distant Thunder
Activision Anthology
Advance GTA
Adventures of Cookies and Cream
Aero Elite: Combat Academy
Aerofighters Assault
AFL Live 2003
AFL Live 2004
Age Escape 2
Age of Empires 2
Agressive Inline
Airblade
Alex Ferguson's Player Manager
Aliens vs. Predator: Extinction
Alpine Racer 3
Allstar Baseball 2002
Allstar Baseball 2003
Alone in the Dark 4
Alter Echo
Amplitude
Ancient Gates, The
Ape Escape 2
Aqua Aqua
Arc the Lad: Twilight of the Spirits
Arctic Thunder
Armored Core 2
Armored Core 2: Another Age
Armored Core 3
Army Men: Air Attack 2
Army Men: Green Rogue
Army Men: RTS
Army Men: Sarge's Heroes 2
ATV Off Road Fury
ATV Off Road Fury 2
ATV Quad Power Racing 2

These are just a few games under the letter 'A'  there are cheats, codes and guides for all letters in the alphabet to many to list here.