The final version of Silverlight 4 has been released today for Windows and Mac OS X. The RTW (Release to Web) version of Silverlight 4 can be downloaded today for the said mentioned platforms to view and create RIA apps. Also released today are Silverlight 4 Tools RC for Visual Studio 2010, Expression Blend 4 RC and Silverlight 4 Toolkit April 2010 Release.
When working with WPF/Silverlight in Blend, it is quite irritating having to actually switch between Visual Studio and Blend throughout the course of the project by opening the project from its folder location again and again. I bet you might have wondered atleast once whether there was a way to open your project in Blend directly through Visual Studio!