Just this morning I became friends with WeeHouse on Facebook! WeeHouse is a company based in the Twin Cities who build pre-fab as well as custom modular homes. They are concerned with sustainable design principles such as building small and efficiently.
In their own words, "Architecture in a box! House. Cabin. Addition. Rooftops. Developments. Multi-unit dwellings. weeHouses are study enough to withstand the extremes of desert or tundra, and they may be placed anywhere that is accessible by truck. The weeHouse system is based on modern aesthetics, efficient use of space, and intelligent adaptation of prefab building technology."
Very cool.