Azure in Action is a fast-paced tutorial intended for architects and developers looking to develop cloud-based applications on the Windows Azure Platform. Written by two of Microsoft's leading Azure evangelists, it's designed both for readers new to cloud concepts and for those familiar with cloud development but new to Azure.
Starting with core concepts, the book explores designing and scaling front-end and back-end services that run in the cloud, and more advanced scenarios in Windows Azure. Later chapters introduce the rest of the Azure Services Platform with a particular focus on SQL Azure Database.
Azure in Action is a wonderful book that explains the basic as well as the best practice around designing a robust, scalable and economical cloud application. It's full of handy tips and lesson learned that even an experienced dev will benefit from. Coupled the fact that it is served in a light fun way, sprinked with some internal anecdotes (Did you know that Windows 7 boot from VHD came straight from Windows Azure?), it makes the book a very easy read.
The only downside that it has is: just like any other Windows Azure book, this book has some obsolete bits as the Microsoft team is iterating like crazy. Keep that in the back of your mind when reading this.