Silverlight 2 beta 2 includes many improved and new features:

• Visual Basic and C# Project templates
• Intellisense and code generators for XAML
• Debugging of Silverlight applications
• Web reference support
• WCF Templates
• Team Build and command line build support
• Integration with Expression Blend
• Enhanced Setup with upgrade support 

In particular, it adds several new controls that have been highly sought by developers.

• Text Input*
• Controls*
• Layout*
• Styles/Templates*
• Data Binding*
• Networking (HTTP/S and Sockets)*

Silverlight 2 Beta2 supports a go-live license that allows you to start using and deploying Silverlight 2 for commercial applications. You can download the latest bits at here.