There are some great, public (read: free) resources for analyzing economic data, though many times you have to be willing to wade through and reformat information for presentation purposes. The US Census Bureau collects and analyzes a mountain of useful data.

 "LED on the Map" (for the curious, that stands for Longitudinal Employer-household Dynamics)

 - Provides a map-based view of where people live and work, with several additional layers of analysis on wages, industry, and commuting patterns.

 - Data lags a bit - the current most-recent analysis only covers through 2006 so the current economic situation is not reflected.

Here's an example: 

This map shows where workers earning $1200 per month or less live who are employed in Tulsa County.  Remember - this is up through the end of 2006.