At MIX09, Microsoft introduced the Silverlight 3 that offers web developers more than 60 controls to take advantage of – making it easy for them to create cutting-edge Web applications. Silverlight 3 expands on high-quality and high-definition video experiences with true high-definition video in full-screen mode including stutter-free live and on-demand video. It supports more video formats, including H.264, and hardware-based media acceleration. And Silverlight 3 also adds support for Windows Touch on Windows 7.
Download: Silverlight 3 Beta for Developers
Also, a new web client of Microsoft WorldWide Telescope via Silverlight is released, that lets you to browse the galaxy directly within your web browser! A great example of Software + Service’s previously you required a client install and the images are retrieved over a web connection. A comparison of features between the web client and desktop PC client of the Microsoft WorldWide Telescope software is available here.
More info: WWT web client