What a system. From the official NFL site:
The demand for tickets to Super Bowl XLI greatly exceeds our ability to accommodate the majority of our fans interested in attending. Most tickets are made available through the two teams competing in the game, and to a lesser extent through each of our other NFL teams. Remaining tickets for the general public are made available through a random drawing. There is no other means for the general public to purchase tickets. The NFL does not sell tickets to travel or ticket agents. Entries for the random drawing are accepted between Feb. 1 and June 1 of the year preceding the game in question. …