Hamilton Luske

Hamilton Luske was supervising animator on Snow White and he worked on many other amazing films. He made a list of points that is very helpful if you are doing lip-sync in animation. He talks about how you through body gestures help the lip-sync along and create a clearer and more enjoyable experience for the audience. The list can be founf in 'The Illusion of Life' p462,463 and 464, It is very much worth checking out if you are working on a scene with dialogue.