There are several ways to stay abreast of content additions at PubMed Central (PMC). Some people tend to visit the website (almost) daily, poring over the Full List and New Journals to discern the very latest developments.
Another approach is to stay tuned to STS-L, ERIL-L, the SPARC Open Access Forum or Open Access News, since notifications tend to flow pretty regularly. PMC-News provides ongoing notification directly from the source. Additionally, as noted by my Caltech colleagues Daniel Taylor and Dana Roth, the NLM Technical Bulletin brings PMC content additions together on a monthly basis.
NLM Technical Bulletin - Fulltext no272+ (May/June 1993+); ISSN: 0146-3055.
Posted by
George Porter at 8/16/2004 12:20:00 PM.
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.