A fresh look at the kernel's device model

This is a great idea for an article series. I can't claim it all made sense to me (the, seeming, arbitrary nature of the implementations of just crying out for stricter rules now that we've a large sample set of devices to generalize from--with legacy devices being exempt) but I've a much clearer idea of what is meant by devices and their related interfaces.
To sum up: a device is a thing, and you can choose to ignore implementing it in class.