US

Quentin Branch's RAMMED EARTH
Do It Yourself Rammed Earth
Adobe, Cob, Soil-Cement & Rammed Earth (Building with soil based materials) - research done in 2004, in Del Rio Texas, by John J. Morony.
How To Build a Rammed Earth House, a 1973 article, published in Mother Earth, written by John McMeekin details the rammed earth home he built 25 years earlier. 
Rammed Earth Works - David Easton, Napa, California
Rammed Earth Development (RED) - Tucson, Arizona
Apparatus Architecture (Rammed Earth Specialists) - San Fransisco, California

UK

Rammed Earth Research
DTi Partners in Innovation - Developing rammed earth for UK housing

Australia

Rammed Earth Development (RED) Ltd - Stephen Dobson, Western Australia
The Earth Building Association of Australia (EBAA)
Rammed Earth - The Australian Connection (Steve Davis)
Affiliated Stabilised Earth Group (AsEG) Australia
Natural Building Technology Research Group - University of Bath
Roger Garlick's Hand-Rammed Rammed Earth House - Mullumbimby, Australia
Australia's guide to environmentally sustainable homes: Passive Cooling

Associations

Earth Building Association of New Zealand Inc.
Post & Beam

Others

The German Association for Building with Earth
Rammed Earth in China
Rogers Rammed Earth, a DIY home with photos.
Green Home Building: Rammed Earth Questions and Answers by Leonard Jones, P.E.
Contemporary Rammed Earth Homes Benefits
CRATERRE-French center of reasearch for the study of earth architecture.
Wildlife Works-rammed earth sewing facility in Maungu, Kenya creating clothes for sale on the internet. Sales benefit local economy and wildlife preservation.
Apparatus Architecture - design conventional, rammed earth and PISE structures in Northern California.
Cob Cottage Company - conducting research and providing information on building cob structures.
Rammed Earth Development, Inc. - builds rammed earth and adobe homes.

Research and Development

The Earth Building Research Forum
Rammed Earth Research

Accommodation in Earth Buildings

Woodsong  Forest Retreat

Magazines

The Owner Builder: The Australian Home Builders Magazine