Data Resources

Time Series Data

 * United Nations Common Database - provides selected series from numerous specialized international data sources for all available countries and areas.
 * U.S. Government Repositories - a list of high quality datasets and repositories from the U.S. Government.
 * U.S. Government Transparency - a broad range of information available to track U.S. government and legislative information, campaign contributions and the role of money in politics.
 * EuroStat Datasets - a list of statistical datasets provided by the Statistical Office of the European Communities (EuroStat).
 * Time Series Data Library - a collection of about 800 time series drawn from many different fields.
 * StatLib Dataset Archive - an etherogeneous source of statistical data
 * Global Historical Climatology Network - contains historical temperature, precipitation, and pressure data for thousands of land stations worldwide.
 * World Data Center for Paleoclimatology - archives of reconstructions of past climatic conditions derived from paleoclimate proxies, in addition to the Program's large holdings of primary paleoclimatic proxy data.

News Data

 * New York Times - published as RDF/linked open data, creative commons.

United States GIS Data

 * The National Map Seamless Server (if you can figure out how to use it!)
 * The National Atlas
 * U.S. Census Bureau TIGER files
 * U.S. Census Bureau Generalized boundaries (smaller file sizes than TIGER, less accuracy)
 * Geospatial One Stop (large repository of US GIS data and map services)

There are also a lot of datasets in various web sites that deal with data visualization, although not all of them are time series:


 * ManyEyes Datasets - list of dataset available in Manyeyes.
 * Swivel Datasets - list of datasets available in Swivel.