This is just a quick thought for those who are aspiring animators and are just starting out. Look for the extras on DVD / Blu-ray discs. They will often have "Behind the Scenes" footage showing the process that they went through in making the film.
Most people over look them, but they are a great resource for digital artists. Releases such as "Happiness is a Warm Blanket Charlie Brown" comes with 4 extra titles covering the screenplay, animation and recording of the voice talents. It is a quick glimpse into the process and workflow of animation. The same fundamentals can be applied to both 2D and 3D animation. For more in depth material on animation, I would suggest two books by Tony White; The Animator's Workbook" and "Animation: From Pencils to Pixels"