Penn State, Oklahoma, Iowa State, West Virginia, Pittsburgh
Penn State averaged 1,338 per game for baseball last season, 5,159 per game for women's basketball
Oklahoma averaged 1,289 per game for baseball for the 2006 season (can't find 2007), 9,963 for women's basketball
Iowa State averaged doesn't have baseball, averaged 9,387 for women's basketball
West Virginia averaged below 1,150 per game in baseball in '06, averaged 2,671 for women's basketball
Pittsburgh averaged below 1,150 per game in baseball in '06, averaged 3,911 for women's basketball
Kentucky averaged 1,642 per game for baseball for the 2006 season (can't find 2007), 4,764 for women's basketball
To be the third highest attended sport on campus:
Penn State: 5,160 per game (their rink's capacity is 3,806)
Oklahoma: 9,964 per game
Iowa State: 9,388 per game (based off the picture I saw...yea, not much room there)
West Virginia: 2,672 per game
Pittsburgh: 3,912 per game
Kentucky: 4,765 per game
I still think this'd be very tough at many schools, as many schools don't have the hockey culture of Minnesota.

