Rigging Characters

If you really enjoy rigging characters and/or are interested in character animations, you may want to get a more in depth tutorial at blender cookie.

http://cgcookie.com/blender/2011/12/12/blender-introduction-to-character-rigging/
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Also, if you want to deconstruct some really high-end rigs used for animation, check out these:

http://www.blendernation.com/2010/09/13/free-rigs-for-blender-2-5/