The Human Oral Microbiome Database is an OA database of information about microbes which live in the human oral cavity. The database went live on March 26. The database will contain "descriptions of the microbes, their metabolism, and their ability to cause disease ... linked to information on their DNA and proteins, as well as to the scientific literature."
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.