Pioneering community-based walking holidays in the ancient Ethiopian Highlands organised by TESFA, an NGO based in Addis Ababa. Trips for only 4-6 people at a time were initially focused on visiting the remote parish of Mequat Mariam, but now include visits to other villages as well as treks to the Abuna Yoseph mountain where much of the income goes directly to the villagers who decide collectively how to spend it.
Presented on the "Guardian Green Travel List 2010 - http://www.greentraveller.co.uk/content/green-travel-list-full-0