Why do some bones look like boxes and others like arrows? I've been looking at tutorials on how to rig a model and found this one.
Why does this guy's bones look like boxes while all the others look like triangular arrows? Is there a functional difference or just for ease of viewing? How do I enable/disable this display?
Here are the different shapes for an armature. Also the different controls for changing it. It is for you to decide what you want to use.



The one exception to this is that if you create your vertex weight from envelopes, you can view what will be affected with the envelope option. You must go into edit mode to see all details. More about it here:

http://wiki.blender.org/index.php/Doc:2.6/Manual/Rigging/Armatures/Editing/Properties