International Gorilla Conservation Programme http://www.mountaingorillas.org/
The goal of the International Gorilla Conservation Programme (IGCP) is to ensure the conservation of mountain gorillas and their regional afromontane forest habitat in Rwanda, Uganda and the Democratic Republic of Congo (DRC). IGCP: Gorillas - Tourism http://www.mountaingorillas.org/gorillas/gorillas_tourism.htm The annual revenue earned directly from gorilla tourism is estimated at US$3 million. When combined with the additional income received by, for example hotels and restaurants, the total figure may exceed US$20 million shared between Rwanda, Uganda and the Democratic Republic of Congo (DRC). Tourism, even when well managed, undoubtedly poses a certain health risk to the gorillas (see Threats), but its contribution to the welfare of the local communities is crucial. Gorilla rules - the dos and don'ts http://www.mountaingorillas.org/pdf/Gorilla_rules.pdf List of tour operators http://www.mountaingorillas.org/pdf/Tourism_companies_Jan2003.pdf

