Gray Literature is a term for information (frequently of a scientific or technical nature) that falls outside the mainstream of published journal and mongraph literature. Gray literature is produced by government agencies, universities, corporations, research centers, associations and societies, and professional organizations.
You can find reports by using Google or Google Scholar, through bibliographies at the end of articles, in news reports.
NIRA World Directory of Think Tanks National Institute of Research Advancement list of research organizations
International Affairs Resrouces - list of reserach sites