Be sure to check out the WPF Bootcamp at Mix University.
With over 20 hours of hands on labs, customer examples, and a plethora of topics it will take you through WPF inside and out from start to finish. Here is just a sample:
Keynote: Windows Presentation Foundation
A Lap Around Windows Presentation Foundation
A Lap Around Microsoft Expression Blend
Building WPF Applications Part I
Building WPF Applications Part II
LAB: Building WPF Applications
LAB: Building WPF XAML Browser Applications
LAB: Interactive Fabrikam Catalog in Blend
Controls, Styles and Templates
LAB: Creating a Button with Expression Blend and Design
LAB: Creating a Glass Button in Blend
Data Binding with WPF
Beatriz de Oliveira Costa
WPF Partner Showcase
Documents, Text and the Reading Experience
LAB: Using Data Binding in WPF
LAB: Reading Experience
Windows Forms Interoperability
Visual Studio Orcas Enhancements for WPF
Mark Wilson-Thomas, Mark Boulter
Grab all the content here today!
Also don't forgot about WindowsClient.NET. There is entire learning section around WPF filled with short 15-20 minute digestible videos around various WPF topics.