This article gives a simple introduction to Silverlight Streaming that will allow you to turn your own video content into a Silverlight Streaming application ready for you to place on your website or blog.
Encoding your Video (using Expression Encoder)
Prepare your video (add the manifest file& cleanup output)
Upload your Silverlight Streaming application (via the Web UI)
Place the Silverlight Streaming Application on your Website (via Script or IFrame)