Silverlight 2 is a browser-based plug-in for delivering richer interactive applications to users over the web (like flash)
More Clear,
Silverlight 2 = Flash + .Net
The key benefits of Silverlight 2 is that it can execute any .NET language, including C# and VB.NET .
Silverlight 2 ships with a "lightweight" version of the full .NET Framework, which features, among other classes, extensible controls, XML Web Services, networking components, and LINQ APIs
Silverlight is a subset of WPF , including support for shapes, documents, media, and WPF animation objects
Benefits of Rich Internet Applications includes Client-server balance , Asynchronous communication, Network efficiency
Moonlight ( Silverlight in Linux)
The Mono project , renowned for its open source implementation of .NET, is working on an open source Silverlight port that targets the Linux platform and the project is called Moonlight
