I'm interested in earth homes as well. I'm currently scrounging the web for information, and trying to come up with some viable design options for a future project. I'm not sure what direction I'll end up taking, but that will partially be determined by the area where I choose to settle. I'm looking at a number of different materials ranging from rammed earth to cobb and a few others, as well as weighing out in-ground designs.

I'd like to make this an off-grid home powered by alternative energies, and would like to be able to include rain harvesting or a well, and on-site waste management/recycling. Once again, all of this will also be determined by region and what local laws have to say about such things.

It's a long term goal I guess... I hope I have time. :P

What particular type of structure are you thinking of building, mtman?