Check out Eric Karabell's round-up here
According to an article on ESPN.(go.)com, of over 3 million brackets filled out for the NCAA tournament, only 35,000 had GMU advancing this far (with 7k predicting a Wichita State-George Mason game in the Sweet 16). Not one person has all of the brackets correct, and only 12 people have 15 of their Sweet 16 picks still in the tournament. However...about 500 have lost ALL of their teams already and another 4200 with only one team left. Almost 500 people have either GMU or Bradley winning the entire tournament. Haha. Fan loyalty can be...interesting.