Heather Morrison has a useful series of blog posts on the Dramatic Growth of Open Access. (I regularly blog excerpts here.) If you run an OA resource and wonder why Heather doesn't track your growth in her series, or what it might take to get her to start tracking it, see her latest post on her inclusion criteria.
Posted by
Peter Suber at 9/10/2007 04:01:00 PM.
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.