I have been spending quite a bit of time lately working with Silverlight 3 and SharePoint. One of the first big shifts for me is that Silverlight Development is Client development. Silverlight runs in the browser, but it runs on the client, so no SharePoint Object Model code. You have to access all of the goodness that is SharePoint through its web services.
Once you get started on your project you add a Service Reference and point at your desired SharePoint Web service. You will immediately run into the Visual Studio Warning:
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