Rigging a ball with Cartoon Funtionality
from jabimation

In this four part video we discuss the process of making a squishy squashy bouncing ball rig. The topics cover adding deformers such as lattices and clusters with custom controls, attributes, and hierarchy. We go through using measuring tools to control deformation and break down the process of normalizing values to make our rigs scale properly. We also look at how to use the connection editor to make direct links between attributes from node to node. The techniques involved can be used for many rigging solutions beyond a simple bouncing ball.

Full tutorial here