poseReader update
An integral part of the poseDeformer plugin (written by Michael B. Comet) is the poseReader, a node that is added to your heirarchy every time you create a poseDeformer shape. It is the poseReader that monitors the joint orientation and sets the weight of the associated poseDeformer shape.
By default the poseReader has its readAxis set to the Y-axis. This is convenient if you build your skeletons with the y-axis pointing along the bone, but what if you prefer the x-axis along the bone? Well, you can easily change the readAxis in the poseReader's attribute editor, but its easy to forget - which means your poseDeformations dont work as you expect.
I have recompiled the poseReader.mll with an X-axis default. You can get it here.