Microsoft have now released a new version of their developer guide to Azure as a free ebook
Free eBook – The Developer’s Guide to Microsoft Azure
The book is 62 pages and downloaded as a PDF
Introduction from the book itself
"We created The Developer’s Guide to Microsoft Azure to help you on your journey to the cloud, whether you’re just considering making the move, or you’ve already decided and are underway.
This e-book was written by developers for developers.
And it is specifically meant to give you, as a developer, a fundamental knowledge of what Azure is all about, what it offers you and your organization, and how to take advantage of it all."