First, Matthew MacDonald is one of my favorite technical authors so I was very happy to hear that he was writing a book on WPF. I've been a big fan of one of his other books (Pro ASP.NET 2.0 in C# 2005
) for many years. I use it like a bible. To cut to the chase, Matthew has done it again. Pro WPF, though doesn't fit in your pocket very well since it's 980 pages is great. It carefully explains topics in WPF that are not easy to explain. I have to say I did not understand dependency properties very well until I read that section and it really cleared things up for me.
If I were making stars, I'd give him them all!
Here is a link you can get the book from.
Pro WPF: Windows Presentation Foundation in .NET 3.0