1. Visit http://www.silverlight.net for more information, downloads, samples, etc.
  2. Silverlight is a browser plug-in that runs on IE, Firefox and Safari - Windows and Macs
  3. Silverlight is a vector rending engine that supports an upward compatible 2D subset of WPF graphic description language XAML
  4. Silverlight has built in media support for wmv, wma, mp3, jpeg and png files on both windows and MAC with a few lines of code and WITHOUT media player
  5. The 1.0 Version of Silverlight supports javascript client side scripting in a download a little over 1 mega byte.
  6. Version 1.1 of Silverlight will contain a subset of the CLR allowing client programming with any .net language (yes, Mac too)
  7. From a security standpoint, Silverlight runs in the context of the browser and does not have full access to the client machine.
  8. There will be a DLR (Dynamic Language Runtime)  add on for Silverlight allowing creating of the client side dynamic language of your choice.
  9. WPF and Silverlight allows even a video to be used as a paint brush texture so you can "paint" items with video.
  10. Using VB.NET or C# instead of JavaScript on the client can be up to 1000 times faster.
  11. Silverlight allows you to progressively play media content from any server or you can point to a streaming server.
  12. Silverlight can work from any server, windows or linux, IIS or Apache.
  13. Silverlight allows you to blend html, ajax and vector graphics.
  14. Silverlight supports hi-def (720p) full screen video.
  15. Version 1.1 of Silverlight will support JSON allowing automatic marshalling of .NET datatypes to/from javascript.