Thanks mostly to David Berry and Karl Fogel, there is a debate unfolding in the comment section of my post on whether it makes sense to open source books and in what ways the model of free software is transferable (or not) to book publishing.
It is worth reading if you are interested in this debate as the back and forth volley is pretty illuminating.
Somewhat independent of the content, Karl Fogel wrote something that I love, mostly because I often try to remind people of this, although I have not said is as eloquently and tersely as Karl:
I do not understand how you can have ‘libre’ freedom without ‘free as in beer’ freedom. While the latter does not necessarily imply the former, the former always implies the latter. If everyone can share X freely with others, than the cost will always be driven down to zero (hence X will have both freedoms); if people cannot so share, then X is, by definition, not “libre” free.
Much more there, so check it out.