Half of 2011 papers now free to read : Nature News & Comment

"Search the Internet for any research article published in 2011, and you have a 50–50 chance of downloading it for free. This claim — made in a report1 produced for the European Commission — suggests that many more research papers are openly available online than was previously thought. The finding, released on 21 August, is heartening news for advocates of open access. But some experts are raising their eyebrows at the high numbers."