In January of 2009, The YUS Conservation Area in Papua New Guinea became the first of its kind.  More than 35 villages agreed to protect this area, named after the three rivers: the Yopno, Uruwa, and Som, to prohibit logging, hunting and mining.  You can find out more in the article Tim wrote and photographed in the August/September 2010 issue of National Wildlife.  If you missed the issue you can see the whole thing at the NWF website.