If you were designing a slightly-better-than average new house, what Green- or alternate energy / heating / cooling features or systems would you incorporate?

Back in the 1980s and late 1970s I was designing an energy-efficient solar house.

At that time, to my disappointment, solar energy was only really good for heating a water tank or so—wind energy not that promising —wood stoves and the rest were becoming more and more efficient but still very expensive and more like supplemental energy than a main source.

Alternate- and renewable sources, and Green technology has probably come a long way since 1985. Some of the old ideas and systems are still around.

So, what would you implement?