This sample shows how to integrate WCF Routing (released in .Net 4) with RIA Services. Please keep in mind that in order for the sample works, you need the AdventureWorksLT database deployed to your local SQL Server Express instance... and don't forget to update the connection string in Web.config!
More details can be found here
Microsoft WCF RIA Services simplifies the traditional n-tier application pattern by bringing together the ASP.NET and Silverlight platforms using WCF. The RIA Services provides a prescriptive pattern to write application logic that runs on the mid-tier and controls access to data for queries, changes and custom operations. It also provides end-to-end support for common tasks such as data validation, authentication and roles by integrating with Silverlight components on the client and ASP.NET on the mid-tier. It includes rich tooling for integrating client and mid-tier projects and for building rich UI through the simplicity of drag-drop support.
For the latest information please click here .
RIA Services Home Page with links to the download site, MSDN docs, talks ... can be found here.
For help porting applications to the latest bits - Breaking Changes from Beta(PDC 09) to RTW
The document above also insludes guidance on updating VS 2008/.NET 3.5 RIA Services applications to VS 2010/.NET 4
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Please note that once you have downloaded a Sample.zip from below to your machine, you need to right click on the .zip, go to the Property Page and explicitly UnBlock the content. Only then should you extract the .zip file.