The Plugin Reinstaller plugin enables the bulk plugin reinstall.
Download custom collections of plugins automatically from the WordPress plugin directory.
Allows you to install one or more plugins simply by typing their names or download URLs in a textarea.
Upload and install themes and plugins from URL.
Quickly and easily access and install your favorited plugins from WordPress.org, right from your dashboard.
Automates the entire process for migrating your wordpress install from a test/development/source server to the live/destination server.
Redirect to custom locations after logging in. Your Custom URLs along other locations like Add New Post/Page, Manage Posts/Pages/Themes/Widgets, etc.
Use this only if you're trying to move your WordPress install to another domain.
wp-PluginInstaller is a plugin designed to allow plugin writers help their site visitors automatically install plugins in their WordPress installation
Allows the user to install the development version of a plugin for testing purposes.
Makes plugins and themes installs and updates faster, no longer needs ftp details confirmation.
Allows you to one-click install plugins directly from WordPress.org.
(Obsolete) OneClick is a plugin which allows you to install plugins and themes from zip files on your disk, zip file urls, or Firefox.
Update (17. November 2008): I keep this plugin here for reference but since WordPress 2.7 there's a [Plugin Installer](http://codex.wordpress.org/Vers
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