Go to keithurban.net. There you will see an option to register as a member of the site and his fan club. You will receive exciting news about upcoming Keith Urban events and other fabulous snippets via e-mail.
Well, they have an official Keith Urban website. You can go there and become a fan. Or, you could find a fan group on a popular social networking website such as facebook or myspace. Or, you can make your own fan club!