Green Links - Framing & Structural
What are SIPs? -
Structural Insulated Panel Association

ICF (Insulating Concrete Forms)
What are ICF? -
ICF Association

Straw Bale
Although probably not conducive to a humid damp climate like that found in Virginia, nevertheless a very interesting way to build.
What is it? -

Rammed Earth
Again, another interesting technology that is more prevalent in the southwest, but there's no real reason it couldn't be used in the southeast. Very labor intensive.
What is it? -