Directory of Open Access Repositories (DOAR)

"...DOAR will provide a comprehensive and authoritative list of institutional and subject-based repositories, as well as archives set up by funding agencies - like the National Institutes for Health in the USA or the Wellcome Trust in the UK and Europe. Users of the service will be able to analyse repositories by location, type, the material they hold and other measures. This will be of use both to users wishing to find original research papers and for third-party "service providers", like search engines or alert services, which need easy to use tools for developing tailored search services to suit specific user communities..."