Silverlight Streaming provides a service for delivering streaming video applications and content over the internet using Silverlight. The document discusses the availability and updates to the Silverlight Streaming service, how to use it to create and publish Silverlight applications, and the business model including storage limits and pricing. It also covers demos of applications that have been developed using Silverlight Streaming and tools for creating and publishing content like the Expression Encoder plug-in and Windows Live Writer plugins.