In another thread a fella listed off a whole bunch of interesting free-on-the-net movies. This one was probably one of the biggest. He labeled it "garbage warrior".
It contains a long list of really important tidbits:
http://www.tudou.com/v/hdhmr5aj7b4 One thing is that he shows it getting to 35 degrees below zero and yet there is no need for any heat in this house. Thermal inertia takes care of everything.
This film also demonstrates the challenges from government.
It also shows the fun in coming up with a crazy idea and running with it the next day.
While I doubt I'm ever gonna build an earthship, I think this video is loaded with excellent information and excellent lessons.
Thermal inertia is such incredibly powerful stuff!