WordPress has about 10 search forms in backend. With this plugin you will have it on one place - In the Admin Bar.
This plugin requires WordPress 3.3
On the administration you can find different search forms. Some for contents like posts, pages, media or comments. But you have also one for plugins, themes and/or users.
This plugin will centralize all search types into one search form, which is placed in the new Admin Bar. You can change the type via a dropdown menu, take a look at the screenshot.
Does work with network admin too.
Sounds pretty good? Install now!