The Journal of New Frontiers in Spatial Concepts is a new peer-reviewed OA journal from the Karlsruhe University Press. Though the journal has been publishing articles since February 2009, in German and English, it will not officially launch until June 9. It's Karlsruhe's first online journal.
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.