Recently Facebook got rid of “Application About Pages”, which contained a link that let you add Applications that were designed to be installed as Page Tabs to your Page(s). Facebook now suggests adding a link to your app to let people add it to their page, which isn’t practical for apps that are designed for a specific purpose / page in mind.
So I created this quick and dirty bookmarklet that lets you do it from the App Settings page, it scrapes the right values to build the URL to the Add Application to Page dialog and opens it in a new tab.
Works for me in Firefox 10(!), YMMV.