There’s been a lot of talk about Web 2.0 and just what that means. One of the major themes of a Web 2.0 site is how well users can interact and contribute content to the site. Enter Yahoo! Sports and the 2007 NCAA Tournament.

Using the Yahoo! Sports Tournament Pick’em feature, users can join a group, create a group, or just fill out their own bracket. Completely online and interactive. Users contributing content. Online fantasy sports groups are in many ways the precursors of today’s Web 2.0 trends.

Remember when your friends used to e-mail around a spreadsheet w/ the tournament picks in it? No more. Sites like this allow users to contribute their own content and complete the bracket online. Then print it out, share it, rub it in people’s faces after three rounds… whatever.

So welcome to Web 2.0. March Madness style.