If you're going to compare an IBM to a DELL to a Lenovo to determine how green they are, it helps to have a standard. EPEAT is that standard, and its pretty comprehensive - covers performance, heavy metals, recycled content, Energy Star, takeback, packing, a ton of other stuff, and is IEEE certified!
The Standard uses Performance Tiers to evaluate electronic product – Bronze, Silver and Gold. The complete set of performance criteria includes 23 required criteria and 28 optional criteria in 8 categories. To qualify for acceptance as an EPEAT product, it must conform to all the required criteria. Manufacturers may pick and choose among the optional criteria to boost their EPEAT baseline “score” to achieve a higher-ranking level
The registry of equipment is not up yet but will be July 10 or so.