Halo 3 takes UK by storm
It seems that it spurred some hardware sales as well:
http://www.next-gen.biz/index.php?option=com_content&task=view&id=7349&Itemid=2
According to ChartTrack, Halo 3 was bought by one in three UK Xbox 360 owners in its first week on sale. The title more than doubled weekly sales of Xbox 360 hardware to the highest weekly level during 2007, beating Nintendo's Wii for the first time in months.
Halo 3 sales accounted for 68 percent of all Xbox 360 software sales over the past week, and helped to catapult Microsoft’s next-gen format to its highest sales week ever in the UK. The title has become the second fastest selling game ever in the UK behind Rockstar's Grand Theft Auto: San Andreas.