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Download the white paper OpenStack vs. Closed Clouds - The AOL Factor

Not sure if I agree with this article comparing Amazon's strategy to AOL's but this is a good article on why Open Standard is beneficial.  Many cloud applications should be vendor/standard agnostic. I think Amazon has a suite of great products that's easy to use with somewhat proven reliability. With more tools available for Amazon right now versus OpenStack, I'm leaning more to use Amazon.