I crunched some numbers...
Final Four Appearances (1997-2006)
ACC = 10
Big 10 = 9
SEC = 5
Big 12 = 5
Pac 10 = 4
BE = 3 + 2 from former CUSA Members (Marquette, UL)
WAC = 1
Colonial = 1
National Championships (1997 - 2006)
ACC = 3
BE = 3
SEC = 2
Big 10 = 1
Pac 10 = 1
Based on year (NC = National Champion):
2006 = SEC 2, Pac 10 1, Colonial 1......... NC = SEC
2005 = Big 10 2, ACC 1, BE(CUSA) 1......... NC = ACC
2004 = ACC 2, BE 1, Big 12 1.................... NC = BE
2003 = Big 12 2, BE (CUSA) 1, BE 1 ........... NC = BE
2002 = Big 12 2, ACC 1, Big 10 1.............. NC = ACC
2001 = ACC 2, Big 10 1, Pac 10 1.................. NC = ACC
2000 = Big 10 2, ACC 1, SEC 1 ................... NC = Big 10
1999 = Big 10 2, BE 1, ACC 1 ..................... NC = BE
1998 = SEC 1, WAC 1, ACC 1, Pac 10 1 ........ NC = SEC
1997 = Pac 10 1, Big 10 1, ACC 1, SEC 1 ........NC = Pac 10
BB Credits (2001-2006) = Total sum from NCAA
http://www1.ncaa.org/finance/bkb_dist.html
BE = 84
Big 12 = 81
ACC = 80
Big 10 = 74
SEC = 74
Pac 10 = 67
NCAA Credits are calculated as follows:
You get 1 unit for each member of the league that got to the NCAAs and then you earn 1 additional unit for every 'win' each team has getting to the Final Four. Once in the Final Four, no more units are earned.