Just a note
The 360 doesn't have a 'native resolution'. The game developers set resolution is independent of the output.
Some games are developed in 1080i (1920x1080, mostly XBox Live Arcade Games), others at 720p (1280 x 720). The XBox was designed to output -any- resolution independent of that the game actually renders in. This is done using a separate video scaler, where as in the original Xbox, the game was rendered at 480p/i (640x480) no matter what, with no video scaling.
Your XBox360 should be set to output the native resolution FOR YOUR DISPLAY. For my Mitsu, that'd be 1080i. For POSEIDON's LCD, that'd be 720p.
