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> Also, you get more CPU bang for your buck.

I'm not sure this is necessarily true. We did a recent study and found RAX costs almost double for our example web app: http://blog.shopforcloud.com/2012/02/holy-cow-rackspace-uk-c...

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Did you run any actual tests? I recently needed to crunch a big bunch of numbers and, instead of simply comparing specs, I actually benchmarked various EC2 and rackspace configurations to find actual calculations per $. The end result was that using Rackspace (4GB instance) would end up about 30% cheaper than EC2 for my particular work load.

Good point, we didn't actually run the tests. We're planning on expanding our focus beyond just cost to include performance and features of the clouds as well.

Be careful with that on rackspace. If I recall correctly, they use a credit scheduler with burst capacity. You need to be sure that you're not just getting a bunch of burst capacity and factoring that in with your cost calcs.

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