G:

Galaga - Xbox Live Arcade
http://xboxamerica.com/games/210/Galaga

Galaga Legions - Xbox Live Arcade
http://xboxamerica.com/games/607/Galaga-Legions

Gauntlet - Xbox Live Arcade
http://xboxamerica.com/games/103/Gauntlet

Gears of War - Shooter
http://xboxamerica.com/games/47/Gears-of-War

Gears of War 2 - Shooter
http://xboxamerica.com/games/591/Gears-of-War-2

Geometry Wars 2
http://xboxamerica.com/games/597/Geometry-Wars-2

Geometry Wars: Retro Evolved - Xbox Live Arcade
http://xboxamerica.com/games/104/Geometry-Wars:-Retro-Evolved

Geometry Wars: Retro Evolved 2 - Xbox Live Arcade
http://xboxamerica.com/games/601/Geometry-Wars:-Retro-Evolved-2

Geon: Emotions - Xbox Live Arcade
http://xboxamerica.com/games/469/Geon:-Emotions

Ghostbusters - Action
http://xboxamerica.com/games/335/Ghostbusters

Go! Go! Break Steady - Xbox Live Arcade
http://xboxamerica.com/games/592/Go!-Go!-Break-Steady

Golden Axe - Xbox Live Arcade
http://xboxamerica.com/games/227/Golden-Axe

Golden Axe: Beast Rider - Action
http://xboxamerica.com/games/593/Golden-Axe:-Beast-Rider

Golf: Tee It Up! - Xbox Live Arcade
http://xboxamerica.com/games/594/Golf:-Tee-It-Up!

Grand Raid Offroad - Racing
http://xboxamerica.com/games/168/Grand-Raid-Offroad

Grand Theft Auto IV - Action
http://xboxamerica.com/games/208/Grand-Theft-Auto-IV

GRID
http://xboxamerica.com/games/566/GRID

GripShift - Xbox Live Arcade
http://xboxamerica.com/games/506/GripShift

GTR - Racing
http://xboxamerica.com/games/228/GTR

Guitar Hero II - Music
http://xboxamerica.com/games/305/Guitar-Hero-II

Guitar Hero III: Legends of Rock - Music
http://xboxamerica.com/games/418/Guitar-Hero-III:-Legends-of-Rock

Guitar Hero: Aerosmith - Music
http://xboxamerica.com/games/565/Guitar-Hero:-Aerosmith

GUN - Shooter
http://xboxamerica.com/games/105/GUN

Gyruss - Xbox Live Arcade
http://xboxamerica.com/games/388/Gyruss