I\'m putting together a WPF application which will eventually use WCF web services as its data source.
During the prototyping phase, I\'m using LINQ to SQL on an SQL 200
You'll probably want ADO.NET Data Services. You'll have to add an IUpdatable interface implementation to your entities, and you can use LINQ to SQL, Entity Framework, SubSonic, or a number of others. We're using the CodeSmith PLINQO templates, which allow you to add this functionality to LINQ to SQL.