UNESCO has released Policy Guidelines for the Development and Promotion of Open Access by Alma Swan.
Here's an excerpt:
The Policy Guidelines can be used by individuals as a basic text on Open Access and related policies. While we recommend that beginners to the world of Open Access should read it from cover to cover, people having some understanding of OA may like to start reading from any of the sections. Decision-makers, administrators and research managers should focus on Sections 8 and 9 that capture all relevant issues of OA policy development. At the end of this document, you will find examples of different types of OA policies (Appendix 1), and three policy templates (Appendix 2) to choose and adopt.