Springerlink
Useful collection of electronic books and journals in economics.
Centre for Economic Policy Research (CEPR)
Publish books, working papers, newsletters and conference reports in economics.
Social Science Research Network (SSRN)
Electronic bibliography to about 300 000 working papers in the social sciences.
JSTOR
Full text archive to more than 1000 journals.
Proquest
Digital dissertations. The first 24 pages is free.
NBER
National Bureau of Economic Research (NBER) is the biggest research organisation in economics in USA.
IMD World Competitiveness Online
A unique and comprehensive database on the competitiveness of nations that includes time series from the IMD World Competitiveness Yearbook.