Nature Publishing Group and Palgrave Macmillan have released data from their Author Insights Survey.
Here's an excerpt from the announcement:
The survey, which contains views from 30,466 researchers, is the biggest publisher survey of authors' views to be made open access.
NPG and Palgrave Macmillan are making this anonymised data available in order to achieve greater understanding between authors, funders and publishers, particularly with regard to open access.
Digital Scholarship | "A Quarter-Century as an Open Access Publisher"