This organization makes conference papers searchable and provides full text access to many of them. SSRN collects conference papers, journal article pre-prints and working papers in the social sciences. This is a good place to find very recent material. Use the Advanced Search option.
James McGann at the University of Pennsylvania ranks public policy organizations each year. The report organizes ranking by the world and by region in addition to rankings by area of research.
The National Bureau of Economic Research sponsors high quality research and makes it available on the organization's website.
PolicyFile
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Provides online access to abstracts and full-text articles on public policy research and analysis from think tanks, university research programs, research organizations and publishers. Much better results than searching Google.
Search of think tank websites sponsored by the Harvard Kennedy School. Includes a mix of non-partisan and partisan due to organizations' impact and reputation.
Think tank that provides information on social issues, public opinion, and demographic trends. See in particular material under the topics Immigration and Latin America.