I just finished listening to Will Wilkinson's "Free Will" conversation with Who's Your City? author Richard Florida.

At Florida's website, one can find a lot of interesting information about urban areas. One that jumped out at me was the clear spatial distribution of single men and women. If people are voting with their feet based on available marriage partners, we should see men moving east and women moving west, ceteris paribus. I'll be interested in seeing what this map looks like in ten years.