David Weinberger has a post today reporting on the new Nature magazine site, Precedings.
Here's the blurb from the Nature site:
Nature Precedings is a place for researchers to share pre-publication research, unpublished manuscripts, presentations, posters, white papers, technical papers, supplementary findings, and other scientific documents. Submissions are screened by our professional curation team for relevance and quality, but are not subjected to peer review. We welcome high-quality contributions from biology, medicine (except clinical trials), chemistry and the earth sciences. More details.
David also notes "that arXiv has done this for physics and other disciplines."