Plugin to simply add multiple posts or pages at once by entering their titles. Handy tool if you have a new blog and want to quickly add pages..
Plugin to change your default admin username ( with GUI to change all other admin names too ).
The Fix Facebook Like plugin fixes problems like wrong thumbnail, title, description, URL, and gives few more options for your WordPress.
Display a different theme for each user level.
Display a different theme to the user if the user is logged in as an admin.