The hugely successful Fallout 3 is well, HUGE as far as an explorable world goes. Literally you could spend hours upon hours just walking around finding new objects everywhere you go. Well be prepared to waste a little more time wondering around the barren wastelands of a post apocalyptic world. With the addition of 3 new areas with all new missions Fallout 3 has just become a little bigger.
"Commencing in January, Operation: Anchorage adds a brand new dimension to the critically acclaimed RPG, as players enter a unique military simulation to liberate the city of Anchorage in one of the seminal battles of Fallout lore.
Operation: Anchorage will be followed closely by two additional episodes, The Pitt and Broken Steel, adding new quests, landscapes, enemies and more to the vast Fallout universe. Beginning in January, the full “Fallout 3” experience will only be available via the Xbox LIVE Marketplace and the brand new Games for Windows – LIVE Marketplace."

Is it just me or does Xbox seem to swarm with downloadable content for continuing these multi platform games? Good on you Microsoft, keep it up.