I owned Fallout 3 for the 360 and beat the main story (and most of the side-quests) before Operation Anchorage came out. Before I got around to buying it, I ended up building a new PC which unlike the old one CAN play Fallout 3.
I traded in Fallout 3 for 360 and have been waiting for the Game of the Year Edition ever since. Hurry up, October! I want my expansions and GECK to play with!! :)