Silverlight 5 Beta just came out yesterday and I am jumping on it with my first video tutorial.
In this short 12 minute video I show you how to:
1. Create a custom DataType called Developer.
2. How to create an ObservableCollection of Developers and then turn that into a DataSource.
3. How to bind that DataSource to a ListBox and define a DataTemplate that describes how to show the data (namely a TextBlock for the name and an Image for a picture of the developer).
4. How to remove that DataTemplate and add it to App.xaml and define a new property called a DataType.
You will then see how Silverlight 5 will automatically find that DataTemplate anytime you are displaying that custom DataType.