Solar roof shingles.
Every house built in the future may come with them.
More research is needed to confirm feasibility (cost, durability, longevity, ROI, etc) but it certainly is a step in the right direction.
Might be worth investing in, as we come out of this recession (in a year or two).
Here is an article by DOW on their plans with Building Integrated Photovoltaics (BIPVs). Apparently, solar electricity cost is approx 300% more than conventional. Dow is planning to reduce this to approx 25% more. It will be interesting to see how they progress in the next few years.