EconPapers use the RePEc bibliographic and author data, providing access to the largest collection of online Economics working papers and journal articles.  As of May 2006, there is a total of 375,364 searchable working papers, articles and software items with 273,186 items available on-line. 

The majority of the full text files are freely available, but some (typically journal articles) require that you or your organization subscribe to the service providing the full text file.