Oxford University Press has recently announced that they 
will deposit articles into PubMed Central(PMC)on authors' 
behalf. They will do this for authors who have paid a fee 
to make their articles open access in one of the Oxford 
Open biomedical journals. This applies to NIH-funded 
articles as well as non NIH-funded articles.

The Nature Publishing Group (NPG)has announced that they 
too will deposit authors' work in PMC as well as in the 
UKPMC. Authors may opt-in during the submission process,and 
NPG will deposit the accepted version of the authors 
manuscript on acceptance, setting a public release date of 
6-months post-publication. There will be no charge to 
authors or funders for the service.