Best selling game of 2007

Best selling game of 2007 anyone? Halo 3? Assassin's Creed? FIFA '08? Eternal Sonata? Nope, that honour goes to Call of Duty 4. The excellent first person shooter has sold over 7 million copies worldwide since the November launch. And who would honestly have predicted that? Sure CoD is a big "brand" but surely I wasn't the only one who thought the move from WW2 to the present day would leave us with a derivative GRAW-style shooter? But from the opening set piece on the sinking ship - and especially during the stealth level in Chernobyl - it was clear that Call of Duty 4 was far more varied, and interesting, than expected. Oh, and the online - all RPG-style levelling up - was excellent too, despite a few early hiccups on the PS3. Roll on CoD 5 then. But what about best selling game of 2008? Anyone care to bet against GTA IV?