MS Corp has published 2 solid books on SOA/service orientation.

1. Dynamic Modeling-Aligning Business and IT

http://www.microsoft.com/downloads/details.aspx?familyid=6DD54E09-A5BD-42AB-BE0D-1CF1C580009A&displaylang=en

This volume looks at how you can use different architectures, from Open Business Standards to IT industry architectures, in a connected fashion to support a dynamic enterprise. This Series is about aligning business architecture and IT architecture through dynamic modeling. Making sure business operations are working well across organizational boundaries is a hard challenge. But it is an increasingly important one to address in today's connected world. A key to success in meeting this challenge is making sure the business and IT operations teams within an organization are well connected. A thorough discussion of a real-world business problem – shipping products from a warehouse to a customer - helps highlight the issues involved in making these connections and meeting this challenge. Particularly, the discussion shows how supporting business operations requirements in the IT organization can play an important role in the solution.

2. Readings In Service Orientation

http://www.microsoft.com/downloads/details.aspx?familyid=4469946F-2723-47A2-9F54-6520DDAE3260&displaylang=en

Many forces are involved with architecture, but the fundamental principles that govern all
architectures are simple: it’s easy, it works, it’s familiar, and it can be trusted.
The purpose of this book is to let you form your own opinions about the impact of
services orientation on your business and computing environments. This book is not trying
to be an authoritative reference for service orientation. Rather, presented here is an interesting
set of classical papers on architecting services by a variety of well-known authors in
the architectural space. The topics, or architectural viewpoints covered, go from a perspective
on business architecture, through model-based tools, to map from the business to
technology to the choices in new IT infrastructure.