Gven that I already use many cloud computing servies such as google docs and indeed this blogging site, I didn't really learn that much. Many of the cloud computer ideas were around in dot-com era, but the time was not right then. Now with broadband and 3G these techniques are more practicable.
I did see people pushing cloud ideas a couple of years ago, but it wasn't clear to me that they would take off. What I did gain from the book was that, these tools are great for small businesses. There is a lot of software for doing things like payroll.