While Guy probably has something more "bunker-like" in mind, it's not uncommon to build with concrete. They're called Insulating Concrete Forms (ICF) and cost a bit more, but not massively more than regular stick building. In addition to being more energy efficient (as insulated structures), they are also much more hypoallergenic.
http://www.forms.org/
I'm a big fan of earth sheltered homes.
http://www.earthshelter.com/performance/
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