Environmentally friendly building methods:
Prefabricated Homes - this is all the rage, ranging from minimilist dwellings to modular condos.
Fab Pre-fab - a compendium of available and prototypical prefabs
Strawbale
Yurts
Structurally Insulated Panels
Earthships
"Recycled" Solar Homes - article
Other Information:
Green Building 101 - Inhabitat's series of articles
Jetson Green - ecobuilding blog with resources