borantula

Most of the plugins and even standart WordPress tabs in the admin menu are not used very often. 
With this plugin you can make rarely used items in the admin menu invisible until you need them. 
You can just toggle them whenever you need them with Toggle Extra button in the left menu.

Clean WP Admin Menu

Still works!

You can make rarely used items in the admin menu hidden.

Dion Hulse

robalan

2.5 brought many great UI changes, but a few seem unfounded and, in my opinion, were steps backward. I’ve never been a fan of left-aligned interfaces. This plugin resets the interface to the center of the window. All proper credit to “Remove Max Width” by Dion Hulse – http://dd32.id.au – all I really did was regress and modify some CSS…

Re-Center Admin

Re-Center Admin is a plugin designed to do exactly what it says - re-center the WordPress 2.5 Admin interface.

Clean WP Admin Menu vs Re-Center Admin