So Silverlight Streaming + Astoria Hosting = Data Binding niceness!
In order to create an Astoria data service all you need is a Microsoft Passport account. To create a service simply navigate to the ‘Online Service’ page on http://astoria.mslivelabs.com , signin to your passport account and follow the directions on the website. The site will walk you throw a 4 step process to design, create and assign credentials to your data service. If the creation process succeeds, you will be given a URL to your new data service. At this point, you can interact with the service using HTTP requests as described in detail in the document, ‘Using Microsoft Astoria’.