One of the items we worked on for the C# Express SKU, was the Screensaver Starter Kit. To start it goto File->New Project and select Screen Saver. Once the project is open, we specifically open up a simple HTML file that will help out people who want this project.
This is a buildable app, with simple explanations that Express users/hobbyists can work on and extend. You too can create your own starter kits - documentation for this is available inside MSDN help.
Have you tried this yet? We would love to get your feedback on our code and the application. What Starter kits do you see yourself wanting/writing in the future?