dashboard bringing kWh consumed by their data centers in relation to online activity. Specifically, they measure energy efficiency per Buy / Sell, their key business metrics. This level of metrics and visualization is a unique step forward in showing the value of energy efficient design and implementation of services.
Their dashboard is also exposed publicly for everyone to view here. This brings a new level of transparency into data center efficiency metrics.
eBay has also released this methodology to the Green Grid for other companies to leverage. They have documented the detailed development steps in a public whitepaper to stimulate further discussion in the peer group of cloud companies.