In the article, Mahesh Sabnis demonstrates how to use Prism in Silverlight by creating a sample application.
Source: Dot Net Curry
With an increasing popularity and availability of advanced features, Silverlight is being used by many developers to create rich browser applications as well as Line-Of-Business (LOB) applications. The focus is on creating rich, flexible, easy-to-maintain application keeping in mind the separation of concerns and loose coupling.
Prism is a guidance designed and developed by Microsoft which provides a set of libraries consisting of patterns for developing composite applications using Silverlight, WPF and Windows Phone 7. These libraries help in designing and building WPF and Silverlight client applications which are easy and flexible to maintain. The current version of Prism as of this writing is Prism 4.