This is a great quick post on some core principles of animation that we use all the time whether it be very little to exaggerated. Looking through shots and even planning yours out, thinking about overlapping action and follow through is an important step to adding some life, appeal and believably to your animations.
So head on over to Animator Island and check out the post!
And then on to Part 3 this really talks about using Squash and Stretch as part of the caricature in the animation. Almost knowing how far you can push a character before the audience notices.
Check it out some… good info. I am constantly learning how to use Squash and Stretch correctly and also when not to use it. I think as with most of the Animation Principles your understanding of them and how to use them will evolve as you evolve in animation.