It will probably come as no surprise that the magnificent David Wiley is behind in the Utah Open Textbook project, which seeks to get inexpensive, open, online textbooks into the hands of students across the state of Utah. http://utahopentextbooks.org/ A project I'll be watching (and supporting) with interest.
The second link is to a blog post by Scott Leslie about OER 'book sprints':
A book sprint “brings together a group to produce a book in 3-5 days. There is no pre-production and the group is guided by a facilitator from zero to published book. The books produced are high quality content and are made available immediately at the end of the sprint via print-on-demand services and e-book formats.” The idea of a “sprint” originates in the coding world, where a group of developers work in a concerted way over a short, intense period to produce some new code. Originally they were face-to-face events, often held in conjunction with a conference or some other gathering, but in the last few years I have seen them sprout up as online events, both tightly and loosely coordinated. Similarly, while Book sprints began as face to face efforts, they too are starting to migrate into online-only events.I like the idea of a book sprint a lot, and will see if I can arrange something along these lines for later in the year.