From Wiki - GameHacking.org
Game Systems Headquarters International
GSHI is a longstanding collaborative group of code hackers, who have contributed many, many codes to the scene, for such cheat systems as Gameshark, Action Replay, CodeBreaker, and Game Genie. The website and forums were started by and are currently coadministrated by the member who calls himself Lazy Bastard. Many people who use these cheat systems and devices are unaware that the companies who manufacture and market them use websites and communities such as GSHI to produce and distribute the codes that cause them to be as popular as they are.
The website is located here: http://www.gshi.org
The community itself gathers at the website's home forums, located here: http://www.gshi.org/vb/