Because the NCAA believed he violated their right to be the sole broadcasters of the baseball tournament. From the Louisiville Courier-Journal website:
About an hour before Friday's first game, the NCAA sent U of L a memo and had it circulated through the press box. The memo said that no one would be allowed to blog during the games, which came as a pretty big surprise since I blogged throughout the Columbia Regional (and saw at least three other media representatives doing the same) and no one said a peep. Also, this restriction was not included on our credentials, and we never signed anything agreeing to this limitation.
Here's an excerpt from that memo:
"The College World Series Media Coordination staff along with the NCAA Broadcasting group needs to remind all media coordinators that any statistical or other live representation of the Super Regional games falls under the exclusive broadcasting and Internet rights granted to the NCAA's official rights holders and therefore is not allowed by any other entity. Since blogs are considered a live representation of the game, any blog that has action photos or game reports, including play-by-play, scores or any in-game updates, is specifically prohibited. In essence, no blog entries are permitted between the first pitch and the final out of each game."
In other words, don't blog because other people paid for the right to broadcast the games.http://www.courier-journal.com/blogs/bennett/blog.html