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There is so much going on in the cloud, acronyms like PaaS, SaaS, IaaS, (any more?) that I'm losing track of what technologies are important (within each category) how relevant each one is.

What are the core cloud technologies that Architects should know about in each category?

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Architects are the cloud . . . –  Wyatt Barnett Feb 14 '11 at 20:57

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A common reason to use the cloud is to scale out. And I think that the hardest thing to scale out is the datastore.

So I think it's important to learn how to understand and use distributed NoSQL databases like Big Table, Cassandra and Dynamo.

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One of our interns recently put together a blog post and whitepaper comparing Amazon's EC2 cloud with Salesforce & VMWare's VMForce offering. This wouldn't be a bad place to start to understand some of the differences between two of the major offerings.

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