We have a holiday season every year, just being a holiday doesn't suffice. Up until NSMB, almost every week was down YoY. Shortly after it's release, we're seeing massive YoY gains (and it just happens to be selling over a million every week...).
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.