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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