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I am currently reading Software Fortresses by Roger Sessions. This book introduces a new approach for modelling large enterprise systems: the software fortress model. In the software fortress model, an enterprise architecture is viewed as a series of self-contained, mutually suspicious, marginally cooperating software fortresses interacting with each other through carefully crafted and meticulously managed treaty relationships. The software fortress model is an intuitive, simple, expressive approach that maps readily to existing technologies such as .NET and Java 2 Enterprise Edition.

Contents:

Preface.
1. Introduction.
2. Diagramming Software Fortresses.
3. Transactions.
4. Drawbridges.
5. Synchronous Drawbridges.
6. Asynchronous Drawbridges.
7. Guards and Walls.
8. Treaties.
9. General Fortress Issues.
10. Internet Fortresses.
11. Business Application Fortresses.
12. Legacy, Service, and Treaty Management Fortresses.
13. Software Fortress Design Review.
14. Case Study.
15. Postlude.

Also check out Rogers latest news letter ... a great explanation of service orientated architectures and a good insight to the style of the book. (Subscribe)