Mobile Robotic Arm

I am sure Wayne did a crane arm lifting a box once, I can't seem to find it anywhere. Martin you remember where that was? 

Yes, I do:

There is an Animation Exercise in the  Course: "Animation in Blender Workflow & Body Mechanics"

https://cgcookie.com/exercises/animating-a-robot-arm 

Taking the Fundamentals;

https://cgcookie.com/courses/core-fundamentals-of-animation-in-blender

and the Animation Bootcamp:

https://cgcookie.com/courses/animation-bootcamp 

before that would be highly recommended (if not crucial).

There is also  Rigging of a crane arm in the CORE: "Fundamentals of Rigging:":

https://cgcookie.com/exercises/05-rigging-a-crane-arm