Sliverlight Learning Guide

Silverlight is Microsoft's framework for building cross-browser and cross-platform rich Internet applications with streaming video, rich text, Ajax functionality and the like. Silverlight 1.1 Alpha also includes a slimmed-down version of the .NET Framework Common Language Runtime and supports Microsoft's new Dynamic Language Runtime. This means developers can build Web applications in familiar languages like Visual Basic and C# and in dynamic languages like IronPython and IronRuby.

Microsoft Silverlight goes live

Microsoft's answer to Flash :)
Check this out www.silverlight.net