This is a rig I've been working on lately. It's largely based on this rig by John David Marte: http://www.youtube.com/watch?feature=player_embedded&v=PZOu2477PWs The rig is far from perfect. Still I'm pretty happy with what I've achieved so far and decided to share it with you guys. Feedback is welcome here: http://blenderartists.org/forum/showthread.php?257209-Book-Rig
Note: This rig is heavily dependent on drivers and for them to work you must enable Auto Run Python Scripts. To do this go to File>User Preferences and enable the tickbox in the File tab. Then you can reload the file and run the script in the text window. Please be aware that this is a security setting and should be disabled if you don't need it. Otherwise you run the risk of allowing malicious code to be run on your machine. DO IT AT YOUR OWN RISK!