Highlights: the growth of open access continues to amaze! The Directory of Open Access Journals added 750 new titles over the past year, a rate of increase of 2 titles per calendar day. This is close to double the growth rate of 1.2 titles per calendar day as reported in June 2007. OAIster recently passed a significant milestone, the 1,000th repository harvested. OAIster added close to 5 million items over the past year, for a growth rate of 30%. A Scientific Commons search now encompasses close to 20 million items.
PubMedCentral is showing early signs of success of the new NIH mandate policy. 466 journals now participate voluntarily in PMC (up from 410 in March); of these, 355 or 75% provide immediate free access. There is a marked increase in the percentage of NIH-funded items that are freely available shortly after publication (30, 60, or 90 days after publication). For example, the percentage of NIH-funded articles freely available within 30 days of publication has increased 50%, from 6 to 9%. (Thanks to Jim Till for the earlier data and search strategy). This remarkable increase in free access immediately or soon after publication is important because it exceeds expectations. NIH allows up to 12-month embargo, but clearly not everyone is interested in taking advantage of this generosity.
RePEC and E-LIS have had strong growth over the past year, each increasing by about 25%. The only negative is Highwire Free, which grew slightly overall but lost one fully free site, producing a small but rare negative growth number. Björk Roosr, and Lauri presented an important study at the ELPUB conference, reporting that close to 20% of the world's peer-reviewed literature published in 2006 is freely available, whether published as open access or self-archived by the author.
The Open Data Edition of Dramatic Growth can be found here. A plain data version (without quarterly growth) is available here - note the second sheet which has data on PMC titles. A list of journals participating in PMC and analysis by time of free access is available here. If anyone would like to collaborate on these documents (even just to be able to download them), please let me know.
The open access movement:
Putting peer-reviewed scientific and scholarly literature
on the internet. Making it available free of charge and
free of most copyright and licensing restrictions.
Removing the barriers to serious research.
I recommend the OA tracking project (OATP) as the best way to stay on top of new OA developments. You can read the OATP feed on a blog-like web page or subscribe to it by RSS, email, or Twitter. You can also help build the feed by tagging new developments you encounter.
