It takes the fun of filling out brackets and applies it to other sports: NFL, NHL, NBA, MLB, even the World Cup and of course March Madness.
Calcutta Fantasy lets a group of friends pick sports teams (via an auction) so that every team only has one owner, and then rewards the owners based on their teams performance.
This site is a free resource to help people set up their own Calcutta Fantasy auctions and spread the word.
To get started: