Ultimate Playoff

We took the six BCS-conference champions and the six highest remaining teams from the final BCS rankings. Then we seeded all 12 teams solely according to their final BCS ranking. The top four teams (Oklahoma, Florida, Texas and Alabama) received a first-round bye.
http://sportsillustrated.cnn.com/2008/football/ncaa/12/12/ultimateplayoff.semifinals/index.html?eref=T1