I've put up a new post at Kairosnews, A Model for Open Textbook Sustainability. I plan for this to be the first of a series of posts on this topic based on what we are doing with Writing Spaces. Partially to share the WS production model and the reasons for it, which seems fairly unique among OER projects. And in part to think through ideas for an article I'm working on. I really believe that the OER movement has put even more effort into how to make "open textbook adoption and publishing . . . a common element of an academic and teaching life." To do this means going beyond the ideal of everyone creating and sharing resources that has been instrumental in promoting OER to date to the practical considerations of how to achieve it. There is some good work going on with this, but it needs go further.