Links from a great blog run by Tomas Jech, an intern at Pixar from what I can gather.
My favourite post (with a great clip) is about defining your character by giving it interesting decisions to make. Going in the Story section.
This one is about giving your character subtext, what I would call gestures with meaning. Adding to the Character - Acting section.
And another about finding original ideas to animate that I'm adding to the Advice for students section.
Found these links over at Monotreme Dreams.