"Host Your Web Site In The Cloud: Amazon Web Services Made Easy" is a pretty easy to read book. I wish there were more books on Amazon web services, best practices and hosting in the cloud in general. Amazon has so many services nowadays that it is hard to keep up with the offerings and it is always better to read about real-world issues and solutions from an independent source, than from Amazon documentation :)
Cloud Architecture Patterns by Bill Wilder is a really good book. After some not so amazing reading recently i was much more skeptical when i got this book but it turned out to be a really great read. It is a no-nonsense approach to scalability and cloud software especially if you plan to host your application on Windows Azure.
About the author
Hi, my name is Artur Ejsmont,
welcome to my blog. I am a passionate software engineer living in Sydney and working for Yahoo!
If you are into technology, you can order my book Web Scalability for Startup Engineers on Amazon. I would love to hear what are your thoughts so please feel free to drop me a line or leave a comment.