Qixing Zheng has posted one video tutorial on Sample Data and Behaviors in Blend.
In previous version of Blend, we introduced data binding features in Blend. However, in order to make sample data targeted to particular applications, designers had to create XML data files in Visual Studio or other editors and then import into Blend. There was no easy way in Blend to generate the sample data they need. Check out how Sample Data makes this process easy in this tutorial!