In basketball attendance (PDF, via MarquetteHoops).
The 2005-06 Big East had 8 teams in the top 50 in average attendance: Syracuse (#1), Louisville (#4), UConn (#15), Marquette (#21), Cinci (#27), Pitt, ND (#41) and Providence (#47). With the exception of USF, all the other members of the new Big East finished in the top 100 in attendance.
How the other conferences did:
Big 11, 9 teams: Wisconsin, Illinois, Mich. St., Indiana, Ohio St., Iowa, Purdue, Michigan and Minnestoa
Big 12, 8 teams: Kansas, Arkansas, Oklahoma St., Oklahoma, Iowa St., Texas, Texas Tech and Missouri
SEC, 7 teams: Kentucky, Tennessee, Alabama, Florida, South Carolina, Vanderbilt and LSU
ACC, 5 teams: North Carolina, Maryland, NC St., Wake Forest and Virginia Tech
Mountain West, 4 teams: New Mexico, UNLV, Utah and Bringham Young
WAC, 2 teams: Fresno and UTEP
PAC 10, 2 teams: Arizona and Washington
Atlantic 10, 2 teams: Dayton and Xavier
Missouri Valley, 2 teams: Creighton and Wichita St.
Remaining C-USA, 1 team: Memphis
The PAC 10 has to be embarrassed by its member schools in terms of attendance. Put to shame by the Mountain West.
No shock that the Big 11 leads in attendance. Biggest schools and biggest arenas.