American county to county migration

Maps awesomeness.  I wonder about the income numbers -- presumably people typically move for higher paying jobs?  but if you move from NYC to AL, you might take an absolute pay cut in return for a relative pay raise?  Also, the numbers for the year will be some mishmash of the job people had in the old location and the job they had in the new location, plus possibly some job seeking time.  If we could look at the numbers for the prior year and the following year, we might have a truer view of the incoming/departing incomes.