Found via the Marcus P. Zillman blog:
The CommonCensus Map Project is redrawing the map of the United States based on your input, to reveal the boundaries people themselves feel, as opposed to the state and county boundaries drawn by politicians. View the maps to see how the country is divided into ‘spheres of influence’ between different cities at the national, regional, and local levels:
This information will finally settle the question over exactly where cultural boundaries lie, contribute to the national debate over Congressional redistricting and gerrymandering, and educate people everywhere as to the true layout of the American people that they’ve never seen on any map before.
Forgive me for laughing at the “finally settle” phrase above, but it is an interesting idea and website.