i am personally thinking about where i could build one of these! for your info check out Dennis Weavers' earthship,
http://video.google.com/videosearch?...er&emb=0&aq=f#
and these are the design principles:
http://www.youtube.com/watch?v=_ozX_nt5A4o
they are awesome, just imagine having a newman energy machine (
http://video.google.com/videoplay?do...89046946&hl=en) attached to one of these houses too.
talk about sustainability!