This is a great plugin that I stumbled across looking for a solution to the free/member blog sites. Have you ever wanted to have some content be free to the public and other content that is set for members only access. But at the same time, you want to streamline the process by which users can become members of the site and access that content. WP Sentry does the trick and then some. It builds off the built in functions of WordPress to organize users and content, but tweaks it to allow a group like subscribers to see private content while hiding any sign of the private content from the public. I see this being a great tool for groups that already have membership roles, such as churches, unions, civic groups, and clubs. But I have also had requests from bloggers looking for this kind of solution to help them monetize their content.

Plugin Homepage
http://www.peteholiday.com/wp-sentry/

The NAVT WordPress Navigation List Plugin has been around for a while now. It allows for full customization of all aspects of the navigation to your site. Create multiple navigation menus and simply drop them in as widgets into your theme. Although it’s a very flexible plugin, it is fully reliant on AJAX on the backend. To a lot of developers that might sound like an attractive feature, but if you ever have a JavaScript error on the back end of WordPress from any other plugin, it will keep you from updating NAVT. Other than that annoyance NAVT seems to be the leader in replacing the wp_list_pages function of WordPress.

Plugin Homepage
http://atalayastudio.com/