Approaches to Open Access in Scientific Publishing
  Approaches to scientific journal publishing that provide free access to all readers are challenging the standard subscription-based model. But in domains that have a well-functioning system of publicly accessible preprint repositories like arXiv, Open Access is already effectively available. In physics, such repositories have long coexisted constructively with refereed, subscription based journals. Trying to replace this by a system based on journals whose revenue is derived primarily from fees charged to authors is unlikely to provide a better guarantee of Open Access, and may be in conflict with the maintenance of high quality standards. 
J. Harnad