After making multiple simple rigs for doors, gates just two legs etc. my first biped rig; The Marine. Marine has both FK and IK rig setups with switch joint chain setup, reserve foot chains, organize outliner, correct naming conventions. Learning to rig is tedious but its unlike anything else, it is the one of the most rewarding aspect of 3D art! Taking a model that is static and to most people just a thing to look at and throw away. With rigging, you see this lifeless model develop a skeleton system and have the power to breath life.
Here is a few screen shots of the controls of the Marine.