This WordPress plug-in makes installing and managing plug-ins and themes incredibly easy. Once installed, it lets you add plug-ins through a new Dashboard tab. You can also install the Firefox extension to add context-menu functionality.
It's simple to set up. You install the WordPress plug-in as you would any other plug-in, activate it, and then install the Firefox extension. Type in the location of the oneclick.php on your server into the Firefox extension, and you're done. You can now install Themes and Plug-ins to your WordPress installation through the context menu in Firefox.
Themes and plug-ins that require a PHP file to be placed in the root Plugins folder need to have that file moved manually. But other than that one hitch, OneClick makes managing WordPress that much easier. It also adds a control panel for backing up and exporting your plug-ins, as well as deleting them from within your WP Dashboard.
It's not often that a small piece of code can have such a large impact on your workflow, but OneClick takes the tedium out of making on-the-fly changes to WordPress so you can focus on making things look and function the way you want.