WikiMapia is an example of this kind of community editing, though it falls short of your vision here.
Here's Seattle, where people have entered some neighborhoods: http://wikimapia.org/#lat=47.655329&lon=-122.338772&z=13&l=0&m=a&v=2 It accepts polygonal entries, though each polygonal entry is tied to a rectangle for some reason. > If you had a lot of people submitting their own version of the boundaries for the same neighborhood, > it would be interesting to create a composite layer. A grid with cells containing the degree of > agreement on whether the cell is in or out. When using the data, one could then determine how > strong of an agreement was appropriate for their end use.
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