After learning about SOA from blogs, InfoQ articles and presentations, I decided to read Thomas Erl’s Service-Oriented Architecture: Concepts,Technology and Design
It is a very comprehensive book that goes into the details of SOA. Although very comprehensive it is easy to read. The book has a case study to reinforce what you have learnt. I like the plain English sections that provide an analogous explanation of SOA.I am halfway in the book, and I will definitely be reading the other SOA books that Mr. Erl has published.