Silverlight 4 Released

Silverlight is a powerful development platform for creating engaging, interactive user experiences for Web, desktop, and mobile applications when online or offline.  Silverlight is a free plug-in, powered by the .NET framework and compatible with multiple browsers, devices and operating systems, bringing a new level of interactivity wherever the Web works.  Silverlight is also one of the programming models for Windows Phone 7 devices.
Key new features in Silverlight 4 include:

• Set of forms controls with over 60 customizable, style-able components.
• Comprehensive printing support.
• The .NET Common Runtime (CLR) now enables the same compiled code to be run on the desktop and Silverlight without change.
• Enhanced data-binding support, data grouping/editing, and string formatting within bindings.
• Managed Extensibility Framework (MEF) supports building large composite applications.
• Silverlight design support in Visual Studio 2010 with drag & drop data-binding, and full IntelliSense.
• Localization enhancements with Bi-Directional text, Right-to-Left support and complex scripts such as Arabic.

Silverlight Homepage
What’s New in Silverlight 4
Developing for Windows Phone 7 with Silverlight