Microsoft Silverlight Streaming  is a new service by Windows Live that makes it easier for developers and designers to deliver and scale rich meda as part of their Silverlight applications. The new service offers web designers and developers a free and convenient solution for hosting and streaming cross-platform, cross-browser media experiences and rich interactive applications that run on Windows and Mac.
Currently the service offers 4 GB storage space, you only need a Windows Live account.
Bryant has created an updated CS Module  that will use the Silverlight streaming service. See Tim Heuer's excellent post  on how to create and upload your Silverlight applications to the server.