This book covers the subject area quite well and is up to date with the release version (unlike previous books that tended to suffer from the fact that they are based on the Beta versions of WF).
Bruce has a conversation writing style that I found to be quite easy to read. He ensures that all code is listed in the books and is available for free download. The examples are easy to follow, comprehensive and useful.
This book is a good entry point into the subject - although you should be aware that you are required to have a good understanding of C# and the .Net framework in general.
One minor gripe is that Apress charge an extra $[...] in order to download the electronic copy of the book. This seems a little steep as you've already paid for the paper version (and they quiz you with page/word questions to ensure you have it). Other Apress books have been free to download the electronic version in the past, so I don't know why they've changed their policy now - other than to earn extra revenue, of course!