Summary and Info
The author's knowledge is unbelievable. I can't imagine how one person could know a subject so deeply.
The tough part of SOA is that there are so many ways to do it: the tip of the iceberg is rpc or document, literal or encoded, wrapped or bare. And the deeper you get, the more architectural decisions there are e.g., java first or contract first, or "in the middle." Hewitt gives you exactly the perspective you need to make these decisions.
He writes beautifully, too.