There was a great answer to how users can manage their posts only from the back-end. What I am wondering, is how to allow users to only see their posts, pages, etc, which have their user id attached to it. I’m applying this to custom post types where the users manage their uploaded media.
Users can only view their content from the front end
You can manage roles and capabilities using this plugin http://wordpress.org/extend/plugins/capsman/
You can even add roles and capabilities as well
http://wordpress.org/extend/plugins/capsman/screenshots/
Also the settings page of this plugin is under Tools>Capability Manager