Want To Really Learn Something About Animation?
Go to Animation Meat.
This site has been around for a while, but it's information is so helpful to both the student and professional animator that it is worth posting. For those who don't know (or are too busy or timid to click on the link) Animation Meat is a collection of animation news, notes, handouts, model sheets, fun facts, practice assignments, and what-have-you covering the history of animation. Pretty much all you need to know.
Oh yeah and it's free.