Other sites that should be of interest to March Madness fans.  I can't guarantee that the links are good, but I've tried to limit the list to those that look like they'll be around for awhile.

Infoplease College Basketball section.  Nice resource for information about the history of NCAA Men's basketball.
"The Official Web Site of NCAA Basketball Championships".
Jeremy Benson's Tournament Stats Page.  More tournament statistics than even the most jaded statistics junkie could digest.