Developing Silverlight 4 Web Parts for SharePoint 2010
Learn how Silverlight 4 can be used to integrate rich, powerful applications into SharePoint, both at the Web part level of integration and at the site level. Walk through a set of key developer patterns.
You can watch my PDC session on demand:
Developer Patterns to Integrate Microsoft Silverlight 3.0 with Microsoft SharePoint 2010
https://microsoftpdc.com/Sessions/P09-05