A demo of Splinter Cell: Double Agent is available for download from Xbox Live Marketplace. The single-player demo takes place in Kinshasa. The country of Kongo is in the middle of a crisis and Sam Fisher acting as a double agent must walk a fine line between the different parties involved.
The demo is sized just over 500 MB and is available only for Xbox Live Gold members for now. As usual, those with a Silver membership will get their hands on this content a few weeks later.
Source: Press release