Mike Taulty shares a 6(!) part tutorial on building a product maintenance application going from authentication, roles, through data services, data models to code reuse in WPF. An excellent reading for all starting to write business applications with Silverlight.
Part 1 – Authentication, Roles and Logging in
Part 2 – Building Some Web ServicesPart 3 - Getting Some DataPart 4 - Adding Some ControlsPart 5 – Running the app and thinking about WPFPart 6 – Porting to WPF