Wolfram|Alpha is an engine for computing answers and providing knowledge. It works by using its vast store of expert-level knowledge and algorithms to automatically answer questions, do analysis, and generate reports.
The Bureau of Labor Statistics is the principal fact-finding agency for the Federal Government in the broad field of labor economics and statistics. This site provides access to data on wages, employment, unemployment, inflation, etc.
Machine readable datasets generated by the Executive Branch of the Federal Government. Includes data from a wide range of agencies and topics: healthcare, crime, transportation, business, and much more.