College Football 2011: Biggest Challenges Facing the Preseason Top 10

The USA Today coaches' preseason poll was released on Thursday with very few surprises.

The conference breakdown of the Top 25 looks like this:

SEC: 8
Big Ten: 5
Big 12: 5
Mountain West: 2
Pac-12: 2
ACC: 2
Independents: 1
Big East: 0

Even though these contending teams are going to be tough to handle in both non-conference and league play, each of these squads have some question marks going into this year.

Let's take a quick look at the biggest challenges facing the best of the best....each of the Top 10 teams.