You can find lots of cheats, cheat codes, trainers, walkthroughs, strategy guides, patches for computer and consol video games at Abby-cheat
The good Points:
Huge archive of trainers and cheats.
Easy navigation.
Updated every day.
Cheats for the major gaming platforms like PC, Nintendo 64, Gamecube, Playstation one, Ps2, Xbox, Dreamcast
The bad Points:
No Sony PSP and Nintendo DS cheats
Other site Onlycheats.com where you can find only videogame cheats and cheat codes.
This site also good, but there is no trainers walkthroughs and patches ... so I think the Abby-cheat is better.