The Xbox 360 Medal of Honor beta has finally begun.
Head to the MOH website and log in to your EA account to redeem a beta key. When that key is redeemed you'll be given a token. That token can be used on Xbox Live to download the beta demo.
It sounds like a key is given to anyone with an EA account.
The Medal of Honor beta has been ongoing on PC and PS3 since earlier this summer. Dan Whitehead did some war for Eurogamer.