The Nature Publishing Group has launched a linked data platform.
Here's an excerpt from the press release:
Nature Publishing Group (NPG) today is pleased to join the linked data community by opening up access to its publication data via a linked data platform. NPG's Linked Data Platform is available at http://data.nature.com.
The platform includes more than 20 million Resource Description Framework (RDF) statements, including primary metadata for more than 450,000 articles published by NPG since 1869. In this first release, the datasets include basic citation information (title, author, publication date, etc) as well as NPG specific ontologies. These datasets are being released under an open metadata license, Creative Commons Zero (CC0), which permits maximal use/re-use of this data.