Google is releasing a new program shortly that lets you manage your ad units all from within the AdSense portal. It will be rolled out in phases, most likely starting with their top producers and trickling down like most of their new features.
What does this mean for publishers? It let’s you paste one ad code on your page never for you to touch it again. via their portal, you’ll be able to change the colors, borders, etc without changing the code block on your site.
For more information, read Google’s help topic