http://silverlight.live.com/

"Microsoft® Silverlight™ Streaming by Windows Live™ is a companion service for Silverlight that makes it easier for developers and designers to deliver and scale rich media as part of their Silverlight applications. The 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. Combined with the ability to create content with Microsoft® Expression and other 3rd party tools, web designers and content publishers wishing to integrate Silverlight applications into their online properties can enjoy complete control of the end user experience."

Not something I've seen before, but something I will be abusing now!