College football has, over the past two decades or so, been all about scoring. It seems as if the days of the great 9-6 or 7-3 games are behind us, as the clear emphasis has been placed on scoring points. A lot of points. But there are programs in the country that excel at keeping the other teams off the scoreboard. And if the saying about defenses winning championships is true, then it's quite possible that the teams on this list may soon find themselves in the hunt for championships, both of the conference and BCS variety. Based on 2009 performance, and the retention of those instrumental in their success for the 2010 season, here are the top 10 naststiest defenses in the Nation.

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