Adminimize Visually compresses the administratrive meta-boxes so that more admin page content can be initially seen. The plugin that lets you hide ‘unnecessary’ items from the WordPress administration menu, for alle roles of your install. You can also hide post meta controls on the edit-area to simplify the interface. It is possible to simplify the admin in different for all roles. Frank Bültge
Inline Google Maps This plugin shows google maps anywhere on blogpage. Just add a permalink of google map to any text (with images) in a page, set title=”googlemap” and you’re done. Also works with complex multimarker maps and KML-based maps. Avi Alkalay
Inline PHP This plugin lets users write php code in their posts/pages, and the php code will be executed there, and the output will be displayed. Use “<exec>…</exec>” or “[exec]…[/exec] “(case sensitive) to quote what you want to execute. kukukuan
One Click Plugin Updater Upgrade plugins with a single click, install new plugins or themes from an URL or by uploading a file, see which plugins have update notifications enabled, control how often WordPress checks for updates, and more. Janis Elsts
WP-Plugin List By placing in your page or post by sources code or using toolbar icon ‘Plugin List’ in your Rich text editor(only if enabled) plugin replaces it with list of currently installed WordPress plugins. Martin Wiso