A:

A Kingdom for Keflings - Xbox Live Arcade
http://xboxamerica.com/games/610/A-Kingdom-for-Keflings

Ace Combat 6: Fires of Liberation - Action
http://xboxamerica.com/games/385/Ace-Combat-6:-Fires-of-Liberation

Aces of the Galaxy - Action
http://xboxamerica.com/games/557/Aces-of-the-Galaxy

Aegis Wing - Xbox Live Arcade
http://xboxamerica.com/games/407/Aegis-Wing

Age of Conan: Hyborian Adventures - MMO
http://xboxamerica.com/games/353/Age-of-Conan:-Hyborian-Adventures

Alan Wake - Action
http://xboxamerica.com/games/28/Alan-Wake

Alien Hominid HD - Xbox Live Arcade
http://xboxamerica.com/games/267/Alien-Hominid-HD

All Points Bulletin - MMO
http://xboxamerica.com/games/176/All-Points-Bulletin

All-Pro Football 2K8 - Sports
http://xboxamerica.com/games/352/All-Pro-Football-2K8

Alone in the Dark - Action
http://xboxamerica.com/games/177/Alone-in-the-Dark

America's Army: True Soldiers - Shooter
http://xboxamerica.com/games/496/America's-Army:-True-Soldiers

Amped 3 - Sports
http://xboxamerica.com/games/95/Amped-3

Arcade Unplugged - Xbox Live Arcade
http://xboxamerica.com/games/249/Arcade-Unplugged

Arkadian Warriors - Xbox Live Arcade
http://xboxamerica.com/games/505/Arkadian-Warriors

Armored Core 4 - Action
http://xboxamerica.com/games/221/Armored-Core-4

Army of Two - Shooter
http://xboxamerica.com/games/222/Army-of-Two

Assassin’s Creed - Action
http://xboxamerica.com/games/312/Assassin’s-Creed

Assault Heroes - Xbox Live Arcade
http://xboxamerica.com/games/320/Assault-Heroes

Assault Heroes 2 - Xbox Live Arcade
http://xboxamerica.com/games/562/Assault-Heroes-2

Asteroids/Asteroids Deluxe - Xbox Live Arcade
http://xboxamerica.com/games/421/AsteroidsAsteroids-Deluxe

Astropop - Xbox Live Arcade
http://xboxamerica.com/games/66/Astropop

Avatar: The Last Airbender - The Burning Earth - Adventure
http://xboxamerica.com/games/401/Avatar:-The-Last-Airbender---The-Burning-Earth