The last few days have seen a bit of open warfare on the "open access" frontlines, surrounding a bill currently being reviewed in the house, H.R. 801, the "Fair Copyright in Research Works Act", which rescinds the NIH's open-access mandate. That mandate requires authors of papers on research funded by the NIH to make a copy of their article publicly available 12 months after publication, and has been in place for a few years now. I haven't heard that the mandate has done any significant harm to science publishers, or made much difference to accessibility of scientific research articles, but I haven't really been following closely and the bio-medical literature is not my speciality, certainly.