This plugin allow you to place widgets into a specialized widget area which you can the add to sidebars to be able to display the widgets depending on the roles of the visitor to the website. I found this particularity useful when wanting to display a logout box on an intranet site only when people where logged in vs when they hit the intranet site from an opened IP which would allow them to see the site but not be logged in. All in all it worked pretty well and has some other great uses for showing specific widgets to specific types of uses if your site has multiple levels of users.
Rating 5 Dragons.
This plugin allows you to selectively display content in your themes active widget areas based on the user roles (Administrator, Editor, Author, Contributor or Subscriber) of logged in users. It also comes with two user status based widget areas for displaying content to all logged in users or all logged out users. All user role and status based widget areas can be displayed in any existing sidebar or widget area within your theme.