Light-gauge steel is being used more often these days to replace wood studs for framing a house. The cost is comparable to wood, and much of the steel is recycled. Steel is actually stronger and lighter than wood, and is termite and fire proof. Also the use of steel conserves our forest resources.
The photo to the right is courtesy of onestopdesignbuild.com.
thermasteel.com makes stamped structural steel componenets.
steelwoodstuds.com makes a combination of steel and wood that can be attached with tradtional wood stud techniques.
buildinggreen.com the pros and cons of steel framing versus wood framing.
EcoCottages.com offers a range of models of complete home kits that are manufactured almost completly out of of steel.
kokoonhomes.com makes light-gauge steel/OSB/soy foam custom panels
architecturebysynthesis.com a system for using grain bins, one inside another and foam between them, as habitable structures.
adaptivesteelbuildings.com the complete guide to metal building homes.