You can now download
the RTM version of Silverlight 4 Tools for Visual Studio.
These tools extend Visual Studio 2010 or Visual Web Developer 2010 Express
with templates and support for Microsoft Silverlight 4 and RIA Services.
If you don't already have Visual Studio 2010 or Visual Web Developer
2010 installed, check out the Web Platform
Installer to get Visual Web Developer, plus the Silverlight 4 Tools for
With the RTM version of the Silverlight tools, you get additional features
for creating out-of-browser applications as well as more support for implicit
styles and data sources.