It is a pleasure to see this title appear because I have been developing with MapPoint and Bing Maps (nee Virtual Earth) for many years, but as an author too, I am aware how sensitive reviews are, so I am keen that any criticism should be constructive. My first impression is that it is slim at about 100 pages, but it does cover some very useful areas. The downloadable code is very useful but seems to be the draft version in parts, even being titled as such, and I did add my own Bing Maps developer credentials rather than use the ones left in the text.
First, here is the book link http://www.packtpub.com/learning-bing-maps-api/book, and the chapter titles. I used Visual Studio 2013 to test the code and ran it in Internet Explorer, Chrome and Firefox on Windows 8.1.