JNoGuest, a Joomla! plugin designed to block access to your Joomla! site to only registered, logged-in users is now available! This plugin redirects guests directly to the login page of either the Joomla! core, or if desired, the login page of Community Builder! It also supports selecting a single Article to be the landing page, to explain to users why they should register!
You can get this great little plugin in my shop!