This document summarizes Mike Taulty's presentation on the new features in Silverlight 4. Some key points from part 1 include: - Silverlight 4 includes improvements to controls, binding and validation, networking, and navigation. It also features better support for desktop and out-of-browser applications. - Visual Studio 2010 and Expression Blend 4 have been updated with new design-time features for working with Silverlight. - Networking capabilities have been expanded, including support for HTTP client stack, sockets, and WCF Data Services. - Navigation in Silverlight 4 is now pluggable through a new UriMapper and ContentLoader system. Part 2 of the presentation will cover