On the NetTuts.com site they've posted a screencast that introduces you to the Symfony 2 framework and some of the functionality it offers.

In this first introduction video (of a new series), I'll show you the basics of working with the Symfony 2, PHP framework. We'll go over finding the online documentation, downloading, installing, and simple configuration for the framework. Lastly, we'll take a look at a bit of the prebuilt code that ships with Symfony 2.

This video just introduces the framework and gives you a feel for moving around in it and configuring it for general use. In other (upcoming) videos in the series they'll dig into actually creating a sample application via controllers, templates, routing, etc.