Check these out:

http://www.networkearth.org/naturalbuilding/ceb.html

http://80.237.211.43/basin/publications/books/CEBVol1.pdf

http://80.237.211.43/basin/publications/books/CEBVol2.pdf

Peter Walker and Andrew Heath at Bath University are doing some work on them, I think they are trying to use them in the UK, arguing that in some applications there is little difference between fired and unfired bricks.

Just a few terms to consider
unfired brick - like a regular clay brick, but not fired
compressed earth block - clay mix, compressed in a press, sometimes with shaped faces to allow interlock
cement stabilised brick - like a regular clay brick, but with cement added
compressed cement stabilised earth brick- cement mix but compressed

I put a few pictures of compressed cement stabilised earth bricks in India on flickr (http://www.flickr.com/photos/pauljaquin/1305658302/in/set-72157602225327478/). Really you just need a press (I think they were called Elephant presses), I'm sure the designs are available somewhere.

The 'master' of compressed earth brick construction is Satprem Maini, who runs the Auroville Earth Centre in India (www.earth-auroville.com), and has produced thousands of homes in south east Asia using these bricks.

In 1953 I made 7000 earth bricks 12"x6"x6" and roughly 90% loam,5% sand and %5 portland cement. These were for the 14" walls of a house in the dry climate of Central Otago New Zealand. The large roof overhang protected the surface of the bricks from rain damage. The bricks were not rendered or otherwise protected.

The loam,sand and cement was mixed in a concrete mixer with a trace of water. Then the mix was pounded by hand into a steel mold on a wooden platten at the base of the mold. When the mix was level with the top of the mold a foot lever raised the mold base and the 'green' brick lifted on the platten and placed on the ground for 24 hours. There after they were stacked for about 3 months. Back breaking.

Yes Neil intact and comfortable amid the packed housing of modern Wanaka. Suggest you specify 'Eely Point Road Wanaka New Zealand' on Google Earth. You will be looking at an east-west road. On the south side about halfway down the road is a large section with a single L shaped house mid section. There is a tennis court near the road. That was the Ellis homestead built when there were only two other houses on the peninsular. Now worth a dollar fortune.

The loam was sifted in a rotating sieve as was sand, both from the section. The base was excavated for 4 feet deep and filled with 6 inch stones from the Clutha River. Then an overlay of smaller stuff ,2 inches of concrete, chicken wire to which the electrical heating circuits were clipped then a further 2 inches of concrete. The outer perimeter 14 inch wide foundation was lined with 3 inch cork slabs to reduce the heat loss. All the internal divisions were built with the same bricks and plastered then painted. A 14 inch wall gave a large mass for thermal storage so the house was cool in the summer heat and liberated the solar gain through the evening. In winter with the lake often foggy the house maintained the heat from the underfloor heating supplemented by driftwood from the lake. My do I miss the quietness and space.