There is a spate of wonderful documentaries on Niyamgiri, which has slowly emerged as a major issue in the international arena. Surya Dash, the budding new filmmaker from Orissa, has put his lovely 96 minute long documentary film Niyamgiri- The Mountain of Law on youtube (in sections) in full.
Survival International has made a beautiful vignette on Niyamgiri and Dongaria Kondhs. The film is called Mine: Story of a Sacred Mountain The film can be downloaded from the site.
Please see these movies. They are moving and they are very well made.