The Open Group has released their SOA Source Book.
The introduction tells us “The Open Group’s SOA Source Book is a collection of source material for use by enterprise architects working with Service-Oriented Architecture. The material reflects input from a large number of people from a wide range of Open Group member companies, including product vendors, consultancies, and users of SOA. In some cases, these people have brought concepts developed, not just by themselves, but by groups of people within their organizations. The input has been refined and further developed through discussion within the Working Group. The value in the result is due to the ideas and efforts of the Working Group members.”
The book is free for online reading, go get it!