Social Science Research Network
From their website:
Social Science Research Network (SSRN) is devoted to the rapid worldwide dissemination of social science research and is composed of a number of specialized research networks in each of the social sciences. We have received several excellence awards for our web site.
Each of SSRN's networks encourages the early distribution of research results by distributing Submitted abstracts and by soliciting abstracts of top quality research papers around the world. We now have hundreds of journals, publishers, and institutions in Partners in Publishing that provide working papers for distribution through SSRN's eLibrary and abstracts for publication in SSRN's electronic journals.
The SSRN eLibrary consists of two parts: an Abstract Database containing abstracts on over 675,000 scholarly working papers and forthcoming papers and an Electronic Paper Collection currently containing over 565,500 downloadable full text documents in Adobe Acrobat pdf format. The eLibrary also includes the research papers of a number of Fee Based Partner Publications.