Adobe-Utilizes earth. It is a home for the very rich or for the poorest of poor.

Adobe Builders-Your portal to Adobe Homes, Rammed Earth Homes, Green Building, Pressed Block, Adobe Houses, and Passive Solar Homes

Gypsum Adobe-If I understand this correctly it stabilizes the soil and helps prevent moisture infiltration.

Hybrid Adobe Home-Now this is a cool place and I mean cool. I'd love to use some of their ideas for my own home.