Open education resources are a contentious issue in the modern, rapidly-changing world. Here are a few sites committed to improving OER's reach and making textbooks more affordable for contemporary students:
EduCause: 7 Things You Should Know About Open Textbook Publishing
Overview of the benefits and drawbacks of open textbooks, published by Educause, an information technology advocacy nonprofit group. Part of their more comprehensive 7 Things You Should Know About series.
Student Public Interest Research Groups (PIRGs)
Student PIRGs (Public Interest Research Groups) is an advocacy group for a variety of public issues, including affordable textbooks.
PIRGs also hosts a comprehensive page on the Higher Education Opportunity Act (HEOA) of 2008, which had its textbook affordability provisions put into effect in 2010:
Conferences, satellite events, and general resources geared toward open access advocacy.
Creative Commons Open Textbooks RSS
Recent news on open textbooks via Creative Commons (the open access license providers):
Community College Consortium for Open Education Resources (CCCOER)
CCCOER is a growing consortium of community and technical colleges committed to expanding access to education and increasing student success through adoption of open educational policy, practices, and resources.