Fallout 3 is slated for 3 DLC packs on Xbox Live in the coming weeks.
Fallout 3: Operation Anchorage is the first downloadable expansion for Fallout 3. Operation: Anchorage follows the story of Anchorage Alaska liberating from its Chinese Communist captors. Available for download in January 2009.
Fallout 3: The Pitt is the second downloadable expansion planned for Fallout 3. Players journey through the industrial raider town located in the remains of Pittsburgh. Available for download in February 2009
Fallout 3: Broken Steel is the third downloadable expansion for Fallout 3. Players join the ranks of the Brotherhood of Steel and vanquish the Enclave remnants from the Capital Wasteland. Broken Steel will take allow players to adventure past the main story quest. Available for download in March 2009