I used the Facebook "FBML" app (search for it in the app section) and just used custom HTML. Set this as a default tab to show for non-likers. (not sure of the real term there!)
Having said that, we don't use it now that the new Timeline feature is around as you can have a nice graphic at the top of your FB page anyway. We still do use the FBML app for a custom "Contact Us" tab on our Facebook page. Not everyone likes to post public questions on your Facebook page as it uses their real name and profile, so we find this handy to give the shyer folk a chance to reach out to us.