I was browsing flickr for Cob and found this:

Gamelyn’s Cob Workshop Photos»
Cob workshop, Cobville, Oregon, July 2005… I think this is a Cob Cottage workshop.

Mayne Island Cob House photos »
“User’s ” Earthen Architecture photos »

Update: There is a Natural Building Group on flickr too:
http://flickr.com/groups/earthenarchitecture/