Kirk Evans is a Microsoft Architect for the Azure Center of Excellence.
Introduction to SharePoint and Azure IaaS
Building SharePoint Apps with Windows Azure Platform as a Service
SharePoint Solutions and Architectures on Windows Azure Infrastructure Services
Understanding Authentication and Permissions with Apps for SharePoint and Office
I just received my copy of Understanding Web Services Specifications and the WSE by Jeannine Hall Gailey. So far, I am loving this book. It focuses mainly on WSE 2.0 (written and published during the WSE 2.0 tech preview, prior to the WSE 2.0 RTM), but also covers specifications not implemented in WSE 2.0, such as WS-AtomicTransactions. I have presented on these same topics several times to my customers, so it is interesting to read how someone explains the same concepts in a different manner. The book does a great job of explaining WS-Security and WS-Policy. This book is definitely going to become a leave-behind item for my customers who are looking at WSE.
While you are thinking about WSE... I thought I would point out some of the incredible work in the community around WSE 2.0: