My list of resources.

The Mud is ad-free and independent.  My recommendations are based on my own personal use of these resources.
EARTHBAG BUILDING TOOLKIT
Mud Home Earthbag Posts
The Natural Building Blog
This is probably the top online resource for earthbag building. Pretty much any question related to earthbag is answered in this prolific blog or its sister site, Earthbagbuilding.com.

Cal Earth Institute (California)
If you want to see earthbag in the flesh, or take part in a course, Cal Earth is a US based centre dedicated to earthbag building.

Earthbag Building, the Tools and Tricks of the Trade.
Don't start a build without this book.

Mud Ball
Yes, I recommend my true earthbag building story as part of your earthbagging toolkit. It's primarily humorous adventure, but also informative.
1. It shows what NOT to do
2. It will motivate and inspire you, as pretty much every review will testify.
3. It takes you through the psychological challenges of the building process and gives tips on how to deal with them.
NATURAL  BUILDING TECHNIQUES
Mud Home Natural Building
The Last Straw
Amazingly detailed blog about all things straw bale and earth plaster.

The Owner Builder Magazine (Aus)
This lovely and practical self-build magazine is packed full of cutting-edge natural building articles.

The Year of Mud
Ziggy has plenty of super natural building posts you can browse.

Build Naturally with Sigi Koko
For earthplaster and strawbale expertise, Sigi's Facebook page and website are the place to go.

Get Rugged (Scotland)
Lovely website full of inspiration and tips. Make sure to pick up the free "Self Build Made Simple" PDF too.

The Talking Natural Homes Forum
A useful free forum for natural builders.

The Mud Home PDF Package
The Mud Home in PDF format. About 65 colour illustrated how-to articles, to date.
INSPIRATION, SUSTAINABLE LIVING, AND OFF-GRID
Mud Home Tiny Off Grid Posts
The Abundant Edge Podcast
Oliver Goshey's podcast is definitely the best in the business right now. He's a meticulous and thorough interviewer. Ask me how I know:)

Low Impact
A wealth of information on sustainable living.

Permaculture Magazine
For permaculture and sustainable posts.

Portugal From Scratch
If you're looking for land on a budget, and want some hard figures and hands-on tips for surviving out of The System, Kirsty's blog is very informative.