Even His Holiness has recently expressed his sadness and sense of helplessness. So it's natural that we feel that way too. Here are some reputable organizations to help you learn more and assist the people of Tibet--those currently living there, those in exile, and the existence of the Tibetan Buddhist culture itself.
"The Official Website of the Central Tibetan Administration" (the site of the Tibetan government-in-exile)
"Free Tibet Campaign stands for the Tibetans' right to determine their own future. It campaigns for an end to China's occupation of Tibet and for the Tibetans' fundamental human rights to be respected."
International Campaign for Tibet
"At ICT, we fundamentally believe that there must be a political solution based on direct dialogue between the Dalai Lama and his representatives and the People's Republic of China."
The Dalai Lama Foundation
"The mission of the Dalai Lama Foundation is to support the development of our shared global capacity for ethics and peace, based on a non-dogmatic ethic of compassion."
One H.E.A.R.T. Foundation
"The Mission of One H.E.A.R.T. is to save the lives of Tibetan women and children, one birth at a time."