Silverlight 4 Training Kit

Module 1: Introduction
Module 2: WCF RIA Services
Module 3 – Authentication, Validation, MVVM, Commands, Implicit Styles and RichTextBox
Module 4 – User Profiles, Drop Targets, Webcam and Clipboard
Module 5 – Schedule Planner and Right Mouse Click
Module 6 – Printing the Schedule
Module 7 – Running the Event Dashboard Out of Browser
Module 8 – Advanced Out of Browser and MEF

Lots lots of video

Must watch