This will help guide you to working papers and technical reports in the Social Sciences.
Most sites make their documents freely available in full text.
The computer science link provides access to computer-related technical reports at Carnegie Mellon and elsewhere. Electronic Papers in Economics WoPEc is a service for finding and downloading the latest research results in economics. It contains over 22,000 papers. RePEc is a collection of archives that supply information about economics working papers, journal publications and software. WoPEc has a sister project called BibEc that is limited to printed documents.