The Open Access Day blog notes that the number of participating institutions is now up to 65. The participants are located in Australia, Canada, Chile, India, Ireland, Italy, Moldova, Mozambique, Peru, Romania, and the United States. Open Access Day is October 14 -- if your institution hasn't yet signed up to participate, there's still time to do so.
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.