Oh, Pokemon Black/White wins easily for the DS. I thought those released in 2010, but apparently not. The PSP had a FFIV remake/re-release and Persona, so those may both challenge Dissidia. As for the main course poll, I feel pretty confident that Portal will do well. It had eight months all to itself. Almost every other big release this year was released in Oct-Dec.
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Yoblazer: http://i43.tinypic.com/25z1non.jpg
Watch and you'll see... SuperNiceDog own me... in the Guru!