A new edition of Programming WPF, by Ian Griffiths and Chris Sells (O'Reilly Media), has been released.
This edition has been comprehensively updated to target the RTM release of WPF in 11/06 with the .NET Framework 3.0. And of course, being a Griffiths and Sells book, this book focuses on the "why" as much as the "how", and includes *an abundance* of illustrative code and figures.
Programming WPF is one of several books that will help introduce you to and master WPF, including:
* Essential Windows Presentation Foundation, by Chris Anderson* Windows Presentation Foundation Unleashed, by Adam Nathan* Applications = Code + Markup: A Guide to the Microsoft Windows Presentation Foundation, by Charles Petzold