Richard Poynder Interview: "Open Access by Numbers" 19 June 2011.
http://poynder.blogspot.com/2011/06/open-access-by-numbers.html

"Few can now doubt that open access (OA) to scholarly research is set
to become an important feature of the scholarly communication
landscape. What is less certain is how much of the world’s research
literature is currently available on an OA basis, how fast OA is
growing, and what percentage of the world’s academic and scientific
literature will be OA in the long-term."