Hopefully you caught this article over the weekend. It has been picked up and repeated like crazy!
Kenneth Harney of the Washington Post wrote a column entitled Is green good for home resale? The article highlights studies from Seattle, Portland and California. It offers nice perspective on why these reports are so promising, but also what the needs are for the research to become scientifically valid.
One thing that has caught my eye is that the signal to the market to define a premium is the availability of third-party verification of the "greenness". This seems to be the only way credibility about a build or remodel can pass from builder/contractor to home owner to listing agent to buyer to appraiser in a manner that encourages a premium.
Hopefully work underway to grow Home Performance with Energy Star, Better Buildings and some new lower cost energy scoring tools will accelerate the verification options available to home energy remodeling on existing homes and further drive a premium in that segment.