As of March 30, 2008 there are:
410 journals participating in PubMedCentral (PMC)
Of these:
321 or 78% are available in PMC immediately on publication, i.e. no delay in access. A few (7) of these journals release non-research material only after a delay period.
399, or 97% are available in PMC 12 months or less after publication. This makes close to 400 journals that NIH-funded researchers can confidently publish in, knowing that compliance with the NIH public access policy is a no-brainer!
The list of 399 titles and full data can be found here.
This post is part of the Dramatic Growth of Open Access Series.