A year or so ago i found this wonderful collection of Glen Keane's thumbnail drawings. (PDF provided by animationmeat.com and put into PDF format by Jon Hooper)
There's often a tendancy to jump straight into the animation without much planning (myself included) Drawing thumbnails to plan out the action is vital in the process and will improve your poses and animation overall. It also gives a small introduction into animation/storytelling that would be great for anyone new to animation or just wanting a simple way of understanding the process.
I recommend saving a copy!