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WCF RIA Services has been updated for Silverlight 4 and Visual Studio 2010. You can get the update from WCF RIA Services V1.0 for Silverlight 4 and Visual Studio 2010.
WCF RIA Services simplifies the traditional n-tier application pattern by bringing together the ASP.NET and Silverlight platforms. RIA Services provides a 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.
Bruce D. Kyle ISV Architect Evangelist | Microsoft Corporation