conference in football in the country.

http://en.wikipedia.org/wiki/Bowl_Championship_Series#BCS_National_Championship_Game_appearances_by_team

Just appearance wise with current conference alignment (Nebraska was the only change that mattered).

SEC 11 (4 different teams)
ACC 7 (3 different teams)
B12 6 (2 different teams)
B1G 4 (2 different teams - 1 being Nebraska which was not in the conf at the time)
PAC 3* (2 different teams)
IND 1 (ND)

* Includes 1 appearance by USC that was vacated.

Total appearances by teams below:

4 Florida State ACC
4 Oklahoma B12
3 Alabama SEC
3 LSU SEC
3 Ohio State B1G
2 Florida SEC
2 Auburn SEC
2 Miami (FL) ACC
2 Texas B12
2* USC PAC
1 Tennessee SEC
1 Nebraska B1G
1 Notre Dame IND
1 Oregon PAC
1 Virginia Tech ACC

Just not seeing it...