At the keynote for the Silverlight 4 Launch, John Papa demonstrated how to build a Silverlight 4 application using WCF RIA Services. Now he is elaborating on the presentation and breaking down the steps to create the application.
Here is the completed application that I will show how to build. You can select a book category and the books for that category will appear in the book list in the middle. You can sort by title or author or you can filter the book list by title or author. If you log into the application (as RIA Services integrates well with ASP.NET authentication) I show how to set up permissions to edit the book information too. OK, so this was a stretch as you really don’t want to allow book information to be edited by buyers, but work with me on this :-)