that doesn't tell us who the best conference is it just tells us who the best team is(or in SU's case who the hottest team was). When duke and MD won in '01 & '02 the ACC was NOT the best, the Big 12 was. The ACC was down for about 5 years or so and just elevated back to our normal position of #1 in the '03-'04 season and it continued this year.
Here is a little # for everyone to chew on. Since 1990 the BE has had 4 Final Four teams(SU in '96 & '03 and UConn in '99 & '04) and 2 titles while in that same span the ACC has had 16 and 5 titles('90 duke and Ga tech, '91 UNcCand duke, '92 duke, '93 UNC, '94 duke, '95 UNC, '97 UNC, '98 UNC, '99 duke, '00 UNC, '01 duke and MD, '02 MD, '04 duke).
Also, since 1988 there have only been TWO years w/o at least 1 ACC team while since 1988 there have only been 5 years w/ BE teams. 15 in 17 years the ACC has had at least 1 team in the FF while just 5 of those 17 yrs the BE has had at least 1 team in the FF.