This document summarizes a presentation on Silverlight 4 and Prism. It introduces Silverlight 4 keywords like rich media applications and cross-platform capabilities. It discusses IIS Smooth Streaming for optimizing video playback quality. It also describes Prism for modular application development in Silverlight, and the extensibility of the Silverlight UI through tools like Expression Blend and component libraries. Finally, it outlines a multi-layer architecture in Prism using Entity Framework and WCF services.