Rigging

great Character Rigs and Tools for animation

4 Parts training tools by Jason Schleifer available to learn the ins and outs of creating character rigs

great little series on basic character rigging in Maya

fStretch is a rigging plug-in for Maya creating advanced deformations on polygonal geometries

Building A Basic Low Poly Character Rig In Blender

a complete reference for rigging with Blender.

This book skillfully addresses advanced techniques for character rigging and deforming

creation and rigging of 3D characters

beginners rigging tutorial

the book breaks down rigging so that you can achieve a fundamental understanding of the concept

online school providing personal customized training for character rigging and technical art

Goon rig, a great rig for download