Because was always looking for good answers to all my questions regarding WPF I always wanted a good book that could be more like a guide for me.
Finally I found it and I convince myself everyday that I simplified a lot the "waiting for a good answer" job and I have more time now to concentrate myself on my work. This book, and I can recommend it to you also, is Beginning WPF 4.5 by Full Example.
Good luck in creating amazing applications!