Rammed earth is one construction technique that is experiencing a healthy rebirth all over the world.
Another well known construction technique, wattle and daub, has been used in the construction of low cost dwellings as well as not so low-cost buildings in many parts of the world.
In an article I published in my mestiçagens blog about a year ago I mention a couple of Internet sites that, even though written in Portuguese, describe very clearly this technique.
One of these sites, Chácara da Boa Vista, describes the manufacture of adobe bricks. In the other site, howstuffworks, Fernando Bussoloti describes the rammed earth technique as well as other nature friendly construction methods and techniques.