Check out this guide to animating walks (by someone just learning himself)
I know Andy, and when he does things, he analyzes everything to the n-th degree so there is lots of great stuff here.
Here is the amazon for "The Animator's Survival Kit"
some other books
The Illusion of Life: Disney Animation
by Ollie Johnston
The Animator's Workbook
by Tony White
Cartoon Animation (The Collector's Series)
by Preston Blair
Stop Staring: Facial Modeling and Animation Done Right
by Jason Osipa
Timing for Animation
by Harold Whitaker
The Animation Book : A Complete Guide to Animated Filmmaking--From Flip-Books to Sound Cartoons to 3-D Animation
by KIT LAYBOURNE