http://www.aea.org/ One of the largest economics organizations, the American Economic Association website provides access to information concerning the AEA, upcoming conferences, and publications.
http://www.federalreserve.gov/ Home page of the Federal Reserve system, with links to data and publications as well as the separate Federal Reserve banks.
http://www.aeaweb.org/RFE/ One of the best places to begin your economics research, RFE is a metasite providing annotated links to a wide range of economics related resources.
Provides access to RePEc, the world's largest collection of online working papers, journal articles, and software. Note that this service replaces older economics working paper archives, such as BibEc and WoPEc.