Until today, the great libertarian journal Reason Papers (founded by libertarian icon Tibor Machan) maintained a two-issue moving wall before posting its print articles online. As of today, that changes. The editor, Aeon Skoble, has heroically decided to put all content online as soon as it's published. Issue No. 29 (Fall 2007) has been put online tonight [2/2/09] (the Reason Papers site is hosted by the Mises Institute, natch). Issue No. 30 should be out soon.
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.