Silverlight 2 includes a cross-platform, cross-browser version of the .NET Framework, and enables a rich .NET development platform that runs in the browser.  Developers can write Silverlight applications using any .NET language (including VB, C#, JavaScript, IronPython and IronRuby).  We will ship Visual Studio 2008 and Expression Studio tool support that enables great developer / designer workflow and integration when building Silverlight applications.

This upcoming Beta 1 release of Silverlight 2 provides a rich set of features for RIA application development.  These include:

·         WPF UI Framework: Silverlight 2 includes a rich WPF-based UI framework that makes building rich Web applications much easier.  In includes a powerful graphics and animation engine, as well as rich support for higher-level UI capabilities like controls, layout management, data-binding, styles, and template skinning.  The WPF UI Framework in Silverlight is a compatible subset of the WPF UI Framework features in the full .NET Framework, and enables developers to re-use skills, controls, code and content to build both rich cross browser web applications, as well as rich desktop Windows applications.

·         Rich Controls: Silverlight 2 includes a rich set of built-in controls that developers and designers can use to quickly build applications.  This upcoming Beta1 release includes core form controls (TextBox, CheckBox, RadioButton, etc), built-in layout management panels (StackPanel, Grid, Panel, etc), common functionality controls (Slider, ScrollViewer, Calendar, DatePicker, etc), and data manipulation controls (DataGrid, ListBox, etc).  The built-in controls support a rich control templating model, which enables developers and designers to collaborate together to build highly polished solutions.

·         Rich Networking Support: Silverlight 2 includes rich networking support.  It includes out of the box support for calling REST, WS*/SOAP, POX, RSS, and standard HTTP services.  It supports cross domain network access (enabling Silverlight clients to directly access resources and data from resources on the web).  Beta1 also includes built-in sockets networking support.

·         Rich Base Class Library: Silverlight 2 includes a rich .NET base class library of functionality (collections, IO, generics, threading, globalization, XML, local storage, etc).  It includes rich APIs that enable HTML DOM/JavaScript integration with .NET code.  It also includes LINQ and LINQ to XML library support (enabling easy transformation and querying of data), as well as local data caching and storage support.  The .NET APIs in Silverlight are a compatible subset of the full .NET Framework.

Silverlight 2 does not require the .NET Framework to be installed on a computer in order to run.  The Silverlight setup download includes everything necessary to enable all the above features (and more we'll be talking about shortly) on a vanilla Mac OSX or Windows machine. 

The Beta1 release of Silverlight 2 is 4.3MB in size, and takes 4-10 seconds to install on a machine that doesn't already have it.  Once Silverlight 2 is installed you can browse the Web and automatically run rich Silverlight applications within your browser of choice (IE, FireFox, Safari, etc).