Other candidates for an unbeaten season? Alabama, Texas/OU/Neb, and Oregon...
I don't think Alabama will go unbeaten. Penn State was an OK test, but they are not a top 25 team this year. Road tests at Arkansas, USC, and LSU along with games vs Florida and Auburn will be tough to get through. A 12-1 Alabama team will be tough to leave out, but if there is a Big 12 or Pac-10 unbeaten team I think they will get in.
Oregon is very under-sized on defense and will have problems stopping Stanford, USC, and a few others in the Pac-10. If Nebraska can beat Texas at home on October 16th, they will have a shot to get in with a Big 12 Championship. TCU will have the loss to Boise last year going against them with the voters, so Boise will have to lose for them to get a shot.
For now, here is how I see them...
2) Ohio State
4) Boise St
8) South Carolina
23) NC State
24) Oklahoma St
25) Michigan St