S ince 2003, when PLoS Biology was launched, there has been a spectacular growth in " open-access " journals. The Directory of Open Access Journals (http:⁄⁄www. doaj.org/), hosted by Lund University Libraries, lists 2,816 open-access journals as this article goes to press (and probably more by the time you read this). Authors also have various " open-access " options within existing subscriptio...