An Excellent On-line Manual of Sustainable Architecture
There are two main on-line packages available here: A Consumer Guide and a Technical Manual, which can either be read on-line or downloaded as PDF files. The Consumer Guide features an introduction to good design, guidelines for choosing a place to live, points to consider in either designing or purchasing a home, furnishing the home efficiently and how to help the environment while doing all of this.
The Technical Manual goes further into the nitty gritty of good passive solar design, water use, material use, energy use, and site impacts. There is even a section with lots of case studies of various houses to study. Within the section about materials you can find chapters about embodied energy, rammed earth, adobe, and strawbale.
I heartily recommend taking a look at this fine introduction to sustainable architecture.