Keith Lango is a man who's done his time in the animation trenches.  He's worked at Big Idea, Blur, Reel FX, and DNA studios.  I'm sure he's got his reasons why he chose not to stay in "The System" - among them traveling through South America, delivering much needed medical supplies to impoverished people - but now he's got one of the best animation blogs and tutorial services on the Net.  Here's one in two parts on the Art and Philosophy of Posing.