If you are new to WPF(Window Presentation Foundation) you can use the following links to learn this new technology. The video link given below is not a tutorial but will highlight the features of this new technology.
Windows Presentation Foundation features- Video
You can use these other links to learn this new great technology.
A Guided Tour of Windows Presentation Foundation
Introducing Windows Presentation Foundation
An Introduction to Windows Presentation Foundation
If you want learn the Silverlight Architecture you can use the following MSDN link to learn more.
Use the following link to see of the silverlight samples.
Hope you will enjoy.