The book is interesting and has many good ideas and some valuable information. Be aware, however, that the advanced hacks (those dealing with calling the API from your own code) are based on a now obsolete version of the API. So, for example, Hack 62 that tells you how to find that longitude and latitude of an address doesn't tell you that you can accomplish the task via Google now. Hack 58 (Find the right zoom level) has one (of three) technique that uses an undocumented API that has, apparently, gone away. And, of course, it doesn't provide the easy way to do it using the current API.