Sustainability, an "international and cross-disciplinary scholarly Open Access journal of environmental, cultural, economic and social sustainability of human beings, which provides an advanced forum for studies related to sustainability and sustainable development. Published online quarterly." Inaugural issue, March 2009.
Remote Sensing, a "journal of the science and technology of remote sensing and applications. Published online quarterly." Inaugural issue, March 2009.
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.