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Scott Hanselman wrote an excellent blog post that finally puts some definition behind all those crazy cloud terms. Best of all, he separates out Microsoft’s perception of IaaS, Paas and SaaS and goes specifically into definitions related to the Azure platform. It’s worth a read – there should be at least one term in there that you didn’t know about.
http://www.hanselman.com/blog/ACloudAndAzureGlossaryForTheConfused.aspx