The official site for census information. Click on the Population Clock where you will find a wealth of population information including data on mobility, education, income, poverty levels, trends, immigration, fertility rates and much more under the Population Topics heading.
Site also contains a link to current economic indicators.
The Census website is huge. For an overview, click on the link About the Bureau. This site offers current information on labor and financial demographics including The Current Population Survey, a monthly report based on a survey of 50,000 households, and the Annual Demographic Survey which is the primary source on income and work. Site is good for quick access to commonly used data. FedStats Demographics Organizes the statistical reports of 70 federal agencies by subject.