I’m writing to shamelessly tell that I’ve just released my book on character rigging and animation with Blender 2.5: http://www.packtpub.com/blender-2-5-character-animation-cookbook/book
It has 50 tutorials devoted to create all controls for your characters (from the ground work stuff to more advanced things like stretching, bending, space control, IK-FK blending…) and animate them convincingly (there are chapters dedicated to the Blender workflow and principles like body mechanics and acting).
I’ve created a small promo video about it here: http://vimeo.com/25286653
Along with the book there are more than 100 source files available for download at http://www.virgiliovasconcelos.com/blender-animation-cookbook/
To celebrate the release, the publisher will give free copies for 2 users picked randomly who Tweet the following until next Wednesday (July, the 6th, 11:59 PM GMT): “I want a free copy of Blender 2.5 Character Animation Cookbook http://bit.ly/b3dAnimBook #b3d”
The lucky ones will be picked randomly via http://www.random.org, and the results will be announced next Thursday on my Twitter account. Good luck!