EMBL, the European Molecular Biology Laboratory, has made part of their SIDER Side Effect Resource available to the public free of restriction via CC0, placing it in the public domain.
The database, SIDER, contains information on marketed medicines and their recorded adverse side effects and drug reactions. Included in this dataset is information on the frequency of these drug reactions, other drug and side effect classifications as well as links to other relevant resources. To date, 888 drugs are listed in the database, a tremendous resource for research and drug discovery.
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.