A data search and display utility from Google--still somewhat limited in the coverage, but great fun to play with! You can now find population or unemployment data for states and counties and then interact with the data (do comparisons across counties, states, to the whole U.S., etc.). This is a Google search tool imposed on Bureau of Labor Statistics and U.S. Centus data. Go to Google's regular search screen (Google.com) and enter, for example, population nevada or unemployment rate clark county
Here's an example of a chart generated with population data.
For more information see Google's blog post on this beta utility.