On PopSci's Best of What's New 2005, check out Grancrete:
Grancrete descends from a product developed to encase radioactive waste. And since it takes hours instead of weeks to build a home, it’s poised to provide low-cost, high-quality shelter to the estimated one billion people who lack it. $20.50 to coat 15 square feet. [Thanks to John for the link.]
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