Best Case Scenario

If you like chaos in College Football's BCS system, this would be the perfect scenario -

Auburn beats Alabama and Florida State beats Florida. This would likely put both teams out of running to playing in the National Championship.

Oregon St. beats Oregon and USC beats Notre Dame. This gives Oregon St. the PAC-10 title, but USC would have a higher BSC rating.

Oklahoma St. beats Oklahoma and Texas Tech beat Baylor. This would give Texas Tech the Big-12 South title.
Texas Tech would then lose to Missouri in the Big-12 Championship (Which is practically a home game for the Tigers in Kansas City).

This scenario would most likely put USC and Texas in the National Championship despite either team winning their conference.

This scenario might seem unlikely but crazier things have happened in College Football.

Likely BCS Bowl games if the above scenario plays out --

Rose Bowl -- Penn St. vs. Oregon St.
Orange Bowl -- ACC champ vs. Big East Champ
Sugar Bowl -- Missouri vs. SEC champ (Florida/Alabama)
Fiesta Bowl -- Utah vs. Boise St. - probably unlikely, but it would be cool if both teams could make a BCS bowl. Most likely Oklahoma, Texas Tech, the loser of Fl/Al, or Ohio St. would play in this game despite having two losses.

National Championship -- Texas vs. USC -- This game would put the two teams that are playing the best right now against each other. The media would love this game because it is a rematch of one of the greatest National Championship games of all time. However, there would be a lot of people complaining because neither team won their conference's title.
This scenario would put even more pressure on the BCS to create a playoff.