The XAML SDK is an easy-to-use infrastructure with around 1000 developer focused examples for most of the Telerik WPF and Silverlight controls.
You can also install the Telerik SDK SAMPLE BROWSER for WPF and Silverlight from here. It provides a friendly way of browsing through the repository, automatically connects to GitHub and updates the examples and gives you the ability to directly run them or see their code.
The examples for each of the components in the suite are listed in the documentation along with a short description.