CAT - Rigging - Adjustments

Summary

"We constructed the lower body armature, added IK constraints, and weight painted it. Next we'll tweak the rig to make it easier to control."
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"In this section, we'll make some final adjustments to the rig to make it easier to control. Specifically, we'll add:

• a master bone so we can move the entire character at once.
• knee-lock targets so we can control where the knees point.
• an eye target bone so we can easily change which direction the eyes are looking."

http://wiki.blender.org/index.php/Doc:Tutorials/Animation/BSoD/Character_Animation/Final_rig_adjustments

Eye tracking: Z points up, Y points backwards, so -Y points towards eye the newly created eye bone.

USEFUL TIPS
SHIFT i - IK constraint