http://d.yimg.com/a/p/ap/20100302/ca...56xOE9Hd2MhA--AP - For the last few years, Activision's Call of Duty series has dominated video-game warfare. The latest chapter, Modern Warfare 2, was the best-selling game of 2009, and it still leads the list of Xbox Live's most-played titles, joined in the top five by two earlier CoD releases.
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