Discussion on definition and background information seems to make this book another abstract concept book, but after the few introductory chapters, this book goes into discuss more practical issues. For example, a much needed equation for flexibility is provided as well as equations for service-oriented solution.
Most books are written solely with the purpose to conveying the author's single view. This books, however, contains quotes from many references so readers will be able to know how many organizations view concepts related to SOA. For example, readers will be able to find definition of "SOA" by IBM, W3C, Wikipedia, and OMG. Furthermore, related topics such as OOA, EDA, process-driven architectural types are also discussed so readers will be able to better comprehend the differences.
With so many quotes, this book may look like it's just a collection of quotes but it actually goes on to try to derive a workable definition based on enterprise view (SOE - Service Oriented Enterprise). Enterprise view is advocated over isolated business view to obtain the business goal.
I recommend this book as the first book to read to anyone who is interested in knowing more about service orientation. The book is compact but there are many references at the end of each chapter to for further reading.