All 3 of those SEC teams need to lose another game. If any one of them wins out, they are in, IMO.
The Big 12 just needs to pick each other off. Okie State and Mizzou will both lose, preferrably to K-State. I don't think K-State is all that good, but neither is OSU or Mizzou, IMO. And if K-State loses to Baylor this week in Waco (with the way Robert Griffin is playing, I can definitely see that happening), that will hurt Nebraska's SOS (and I think Nebraska beats OU in the conference title game).
Boise has little to no shot. Their SOS is going to keep them out. It wasn't good enough to get into the top 2 this week, and it's only going to get worse from here on out.
TCU/Utah does have a chance. The MWC is stronger than the WAC, and they both had a decent OOC matchup (Pitt and Oregon State). They may not keep out a 1-loss 'Bama, but I think that an undefeated TCU/Utah might hold us off.
Oregon is going to have a hard time losing without an injury or two, but their schedule is still solid, with games @ USC, Cal, and Oregon State (It's the Civil War, anything can happen there, and OSU is a solid team), and play UCLA, Arizona, and Washington at home. Stanford has a relatively tough schedule, playing @ ASU, Cal, and Washington, and play Oregon State and Arizona at home. I don't think they get through that slate unscathed.
A little extra on OU: The Sooners are ranked #1 because of their rank in the computers. They are #3 and #4 in the human polls. The computers are not the component that you want carrying you, because the teams on your schedule greatly affect that ranking. So they could slide depending on how their opponents fare each week.