Login Check extension(Now magento 1.9.x rwd enabled) stops not registered users from seeing your shops content. You can allow unregistered users to see CMS Pages of your choice(eg. contacts). And you can allow or disallow new users to register and disable the 'Forgott Your Password?' link.
Check out Login Check PRO if you want to allow some modules to bypass the login check, forward to specific URL after login or else.
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