Script Summary: Just a link to make it easier to add an app tab to a fan page
Copyright: 2012+, Paolo Brocco (http://www.pbworks.net)
License: GPL version 3 or any later version; http://www.gnu.org/copyleft/gpl.html
Facebook makes it complicated (see Adding an App to a Page) by making you manually call a URL like this:
With this script, when you click on "Edit Settings" of your App, you will see a new link called "Add Page Tab" in the "Related links" on the left. Just click it to add a tab to one of your fan pages).
Note: the link won't appear if you didn't specify a Page Tab URL (facebook needs it).