A new list of where you can donate to save and conserve the mountain gorillas is out, http://www.gorillasafaris.org
Among the top organisations include the The Dian Fossey Gorilla Fund International, The International Gorilla Conservation Program (IGCP),  The Mountain Gorilla Conservation Fund (MGCF),  Berggorilla & Regenwald Direkthilfe, The Denver Gorilla Run and The Wildlife Conservation Society.
The mountain gorillas in Uganda and Rwanda are only about 650 and the number reducing greatly in the Congo Virungas due to human activity and insurgency. As you track the gorillas in the new Eco tourism era, you are encouraged to donate some more to save the gorillas.
At the same time, the funds can help to conserve the chimpanzees and other primates in Africa. More information here, Gorilla Conservation Projects