IBM really produces a TON of great information on all computer-related topics. One they recently released is this redpaper on Cloud Computing, available here: http://www.redbooks.ibm.com/abstracts/redp5179.html?Open . From the abstract:
"Starting with the basic building blocks of cloud computing, we cover a wide range of cloud topics in this book. We do not go into details of specific cloud products on the market, so this book serves as a cloud primer for readers who are new to this exciting technology. If you are already familiar with the fundamentals of cloud computing and would like to explore more advanced cloud topics, you can still benefit from this book. Each section is independent of the others, so it is OK to skip the sections you are familiar with and go directly to the section you’d like to read first"