Bethesda Softworks has announced this morning that PC owners of their best selling RPG Fallout 3 will indeed be able to create new content for the game. This December the G.E.C.K. (Garden of Eden Creation Kit) will be released, allowing PC owners to alter any aspect of the game and add new characters, dialogue, weapons and more.

In addition, Bethesda announced that the first downloadable content will be released for the game in January, with additional content coming in February and March. The content will be handled by Microsoft's Games for Windows Live user interface. Pricing for the new content has yet to be revealed. Here are the details:

Operation: Anchorage. Enter a military simulation and fight in one of the greatest battles of the Fallout universe – the liberation of Anchorage, Alaska from its Chinese Communist invaders. An action-packed battle scheduled for release in January.
The Pitt. Journey to the industrial raider town called The Pitt, located in the remains of Pittsburgh. Choose your side. Scheduled for release in February.
Broken Steel. Join the ranks of the Brotherhood of Steel and rid the Capital Wasteland of the Enclave remnants once and for all. Continues the adventure past the main quest. Scheduled for release in March.

[via email press release]