This tutorial detailed the Flex SDK and how Flex applications are developed, namely using MXML and ActionScript. You looked at Facebook applications and the technologies that are available to developers who wish to create them, such as FBML, FQL, and the Facebook API.
You used the Facebook PHP Client Library to create a Facebook profile box that returns a list of the user's photo albums. You created a slideshow for these Facebook photo albums using the open source Flex SDK, and you used the Facebook ActionScript API to communicate with Facebook directly from your Flex application.
From the examples in this tutorial you should now be able to create sophisticated and useful Facebook applications using the Flex SDK, as well as general Flex applications using MXML and ActionScript.