rich_

Want a toolbar that stays out of the way? Hover to the corner of the page to get your admin links. 
This plugin was made to enable users to get access to the admin area quickly without the default wordpress 
toolbar. The four corners of the page are configurable via drag and drop settings page.
Please let me know if you have any issues with the plugin or you would like to see additions.

Hot Corners

Replace the WordPress toolbar with configurable hot corners.

gilles66

Need to know which template is used by WordPress to display your pages in the front office ? 
This plugin simply does this.
Show the name of the php file of your theme used to display the current page.Need to know which template is used by WordPress to display your pages in the front office ? 
This plugin simply does this.
Efficient and very easy to install, it will show you in the admin bar the name of the php file currently used to display the current page. 
The color of the text is different regarding the origin of the template(the theme, a parent theme, or a plugin) 
(icon author :http://www.megaicons.net/iconspack-1096/45043/)

which template file

Show the name of the php file of your theme used to display the current page.

Hot Corners vs which template file