Several months ago, Brian Noyes and I delivered a talk on Composite App Guidance AKA Prism at Tech-Ed USA. In the talk we discuss the essentials of Prism and do a bunch of demonstrations (well Brian did) of how to use it's various components. The talk went really well and the feedback we got was people really like what they were seeing. Brian also rocked the stage with his demo magic. If you attended Tech-Ed you can see it live on the Tech-Ed Virtual DVD site by following these simple (and convoluted) steps. You will need to install the latest version of Silverlight to see the video.
If you are not able to log-in, then you can download the slides from the talk below.