Good beginners book but nothing really new. I guess I was expecting more advanced stuff from Shawn but it's all pretty basic. I also have the Windows Phone 8 Unleashed book which is more comprehensive for about the same price. This book does cover a few things that the Unleashed book skips over such as a more detailed section on reading and writing to the built in database on the phone. From that respect it is worth having both books. Just don't expect really in depth advanced sections.
A clear and readable introduction to developing Windows Phone applications. As previously mentioned, the downloadable sample code doesn't match the listings in the book, which is a shame (and should be easy to fix after all). There are a few typos that should have been picked up in proof reading, but these are minor irritations.