Why should the season influence YoY growth, we had the same season at the same time last year too, YoY factors in seasonal changes in demand automatically. Perhaps if the supply was well below demand last Christmas, but it likely wasn't. Christmas 08 was the first time that ebay prices of Wii were not higher than in stores during the holidays.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.