After reading the NIST working definition of cloud computing, which made things more objective to me, I created this chart to provide a visual representation of the different concepts.
Maria Spinola’s white paper, “An Essential Guide to Possibilities and Risks of Cloud Computing“, does a great job covering the major points and is a great reference.
[Update – Feb 2011] A modified/updated version of my chart has been included in the NIST – Presentation on Effectively and Securely Using the Cloud Computing Paradigm v26 (thanks @petermmell).
... or not 
Dear Alex
I wanted to translate the chart into Persian.
first, what is the license?
second, would you please let me have the source file?
Hi Nasser, it’s great that you want to translate the chart. The license is Creative Commons Attribution-Share Alike 3.0. I’ll be in touch via email. Cheers, Alex