Avatar Movie - Behind The Scenes
Really cool video showing how they did some of the action and flight scenes. They also explain how they taped the actors facial interpretation to 'transmit' it to the avatar and several other details.
"Every tiny bit of the performance that you see on the screen was created by the actors. They had to run, they had to fight and jump, all the things that you see in the film, they were doing it physically, they were not doing just voice performance." James Cameron
"This is not an animated film, it is all captured performance." James Cameron