The NBER is a private, nonprofit, nonpartisan research organization dedicated to promoting a greater understanding of how the economy works; site organized into 5 sections: publications, research, people, data, and links. The data sources and links are useful and free, the working papers section contains some very interesting material, but unfortunately they are not free. Still, for corporate needs, they may be the solution.
Source: National Bureau of Economic Research (NBER)
Subjects: Economics, Reference / Search