Peter Suber of Earlham College and Caroline Sutton of Co-Action Publishing have produced "a comprehensive list of scholarly societies worldwide that support gold [Open Access] for their own journals." The Excel spreadsheet is sharable under a Creative Commons Attribution license.
http://www.co-action.net/projects/OAsocieties
In Phase Two of their research, the authors hope to "survey the societies turned up in Phase One in order to learn details about their turn to OA, their business models, and the financial and academic consequences of their OA policies."
More information about the project is available at Prof. Suber's Open Access Newsletter:
http://www.earlham.edu/~peters/fos/newsletter/11-02-07.htm#list