By now, everyone has looked at Neal Sample's presentation from Cloud Connect 2011 (arguably the most important keynote as far as I am concerned) of how eBay makes use of the public cloud. I dare say, that they have shown significant and very real cost savings.
Up until early March, the best we could do was theorize and sort of guesstimate at how much could be saved on costs by making use of a cloud based architecture; how much were servers costing, what was their utilization, how many person hours were spent managing them, etc. vs. spinning up AWS instances and shunting excess or unplanned workload into the public cloud. Many vendors offer their own version of cost/benefit calculators and "financial checklists" but they mostly miss the point: consumers of cloud based services need to be honest with themselves about how they consume IT assets and services before they can really estimate their cost savings. eBay did that. They looked at the whole enchilada, discovered where their efficiencies or inefficiencies lie and showed huge cost savings.
I have no doubt that eBay's model has inspired at least a few organizations to look at their utilization. The trick is for them to decide what is right for the organization. eBay's model certainly isn't a one-size-fits-all. It is up to individual organizations to understand their asset utilization profile, their tolerance to risk, and to see how cloud based services fit into their governance model before making such a leap, however compelling it may be.
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