If you can stomach a little shameless self-promotion I'm happy to announce my book "Understanding PaaS" has been published:

http://www.amazon.com/Understanding-PaaS-Michael-P-McGrath/dp/1449323421

If you're not quite sure how cloud computing can change how you work or if you're not sure about the difference between software, platform, and infrastructure as a service then this book is for you.

It give a quick overview of different cloud offerings and explains how Platform as a Service (PaaS) is different. It's not heavy on technical content, but it's more targeted for those in a technology industry and is a quick read. I'll be releasing a second edition by the end of the year so comments / questions welcome.

If you want to try out Red Hat's free PaaS, do it! http://openshift.redhat.com/