Found a great post yesterday about Disney's 12 Principles Of Animation, In A Cartoon, on fastcodesign which I thought I should share. Frank Thomas and Ollie Johnston, 2 of the "9 old men" that worked at the Walt Disney Animation Stuido's, made the laws of physics just for cartoons.
You can read more about it on their site here, but here is a good video from motion artist Cento Lodigiani that describes the principles:
Found this interesting article published on Empire Online about aspect ratios that I thought I would share.
Interesting walk through of an animator's thought process on some shots from Epic by Blue Sky Animator Patrick Giusiano
Scott Lemmer showed some great tips in the Q&A for offsetting the keys, playing with the tangent handles etc to give you the successive breaking of joints required to show overlap, drag, and weight, but there are also a great set of videos from Keith Lango about on the Pendulum which you may find useful:
Also here is the wave principle from Preston Blair's book Cartoon Animation page 142 that Scott was talking about:
As Scott mentioned in the Q&A you don't want to move the geometry on the pendulum rig, so the easiest way to only have the curves selectable is to go to the object selection mask on the top shelf (the one with the blue plus, blue backward S etc) and turn them all off, then only have the blue backward S turned on, this should then only allow you to select the curves on the rig.