The Digital Academic Repository of Naturalis is a service which is part of a national and international network of scientific and scholarly information services. In the Naturalis repository, the scientific staff of Naturalis stores the electronic version of its publications for future use. The repository also makes sure that references to the publications become available within a international network of information services, hereby increasing the visibility of the publications.
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.