Yup there's an add-on for Fallout 3 called Operation Anchorage. You have to be able to log in to Windows Live from within the game in order to play it. Operation Anchorage costs 800 points so yes you have to pay for it.
http://www.gamesforwindows.com/en-US/Live/Pages/f3operationanchorage.aspx
http://www.gamesforwindows.com/en-US/Live/Pages/f3operationanchorage.aspx
Tue Jun 30, 2009 4:40 am by Mrconfus3d
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