This is the sphere, supersimple and clean face rig, but covers most things you'd need to do with a face. With the deformations I went with a pretty simple approach that takes advantage of the natural deformations of the geometry, meaning there isn't much shape correction or sculpting, just very smooth clusters moving geometry with a nice falloff and generating spline-ish mouth shapes.
Everything was 'baked' into rows of blendshapes with inbetweens (10 inbetweens per each blendshape), for round interpolations, instead of the dreaded usual linear morphy morphy.
The dots open and close the eyelids :P