Matthew I did not take the time to really READ these and could not find anything definitive Like a Home theater primer type article will look more later. I would like to get these down. On a quick search I ran into engineering courses to register for…with out an explanation of the different classes this is the little I found quickly.
http://www.class-d-amplifier.nl/Classes.htm

http://www.eatel.net/~amptech/elecdisc/ampclass.htm

http://www.geocities.com/SiliconValley/2775/clsses01.html