You can take a look by visiting the DOAJ site at: http://www.doaj.org/
Peter Suber’s Open Access Tracking Project links to an SPARC/ARL mailing list posting with some details:
Now there are more than 6300 journals from more than 110 countries in more than 50 languages in the DOAJ. More than 2500 journals are providing metadata on article level, which means that more than 500.000 articles are searchable from DOAJ.
We are pleased to see constantly increasing usage of the service, both directly on the site and most importantly due to increasing harvesting activities from the server.
Due to support from our sponsors and members we have been able to add more journals during 2010 than ever before.
Hat Tip and Thanks: Peter S.