It's launching this week in order to support Open Access Day (October 14, 2008), and to capture the many teaching and learning materials currently under development for it.
The list is looking especially for materials that other users can mine for ideas, and use with attribution, when preparing their own talks, slide shows, brochures, posters, videos, podcasts, and workshops. (OAD merely links to these materials; it doesn't host its own copies.)
OAD is a wiki and appreciates your help in keeping its lists comprehensive, accurate, and up to date.
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.