PubMed has launched LinkOut.
Here's an excerpt from the announcement:
PubMed users can now see the icon that links to the full text deposited at an institutional repository (IR) using LinkOut. The LinkOut service allows you to link to full text, library holdings, and other relevant external resources from PubMed and other NCBI databases.
Digital Curation and Digital Preservation Works | Open Access Works | Digital Scholarship | Digital Scholarship Sitemap