Question about the xbox itself...

Halo, Halo 2 especially if you have Live, Forza, any GTA game, Fable, and Physconaut, etc.

Silent Hill 2, Fatal Frame 1 and 2, Midnight Club 3 Remix, Prince of Persia Sands of Time, Crimson Skies, Otogi 1, Gun, Black, Splinter Cell Pandora Tommorow.

I thought GTA3 sucked on XB because of the lack of 4 shoulder buttons.

These are just the games I pulled from my collection, though most of the ones I own I would recommend.

Advent Rising

Baldur's Gate: Dark Alliance

Beyond Good & Evil

Breakdown

Call of Cthulhu: Dark Corners of the Earth

Chronicles of Riddick: Escape from Butcher Bay

Deus Ex: Invisible War

The Elder Scrolls III: Morrowind (Game of the Year Edition)

Fable the Lost Chapters

Far Cry Instincts

Freedom Fighters

Grand Theft Auto III, Vice City, San Andreas

Half-Life 2

Halo: Combat Evolved

Jade Empire

James Bond: Everything or Nothing

Legacy of Kain: Defiance

Max Payne

Max Payne 2: The Fall of Max Payne

Need for Speed Most Wanted

Ninja Gaiden

Oddworld: Stranger's Wrath

Phantasy Star Online Episodes I & II

Phantom Dust

Psychonauts

Star Wars: Knights of the Old Republic

Sudeki

Tomb Raider Legend

Unreal Championship II: The Liandri Conflict