> Is there a way to grab a list of all the coordinates of, say, all the 
> administrative districts, within the displayed map bounds?

We had a requirement for the same functionality, but had to go down
the route of doing it ourselves. As in the UK specifically, wards (our
version of the administrative districts) are not publicly available.
We've come up with the link below (currently in testing as the url
implies) which allows us to show all manner of information broken down
in the administrative areas. As you can see we currently have it
displaying information about the areas and their councillors for
starters :

http://selfserve.northampton.gov.uk/mycounciltest/

We've written it in such a way that all the stuff which relates to us
(Northampton) is contained in a seperate JSON configuration file. This
means the same page can be used to display details for any city in the
world just by creating a config file for that city. We'll be open
sourcing the lot shortly.

The 'report a problem' option which currently doesn't do anything can
be seen working on the link below ( we need to merge the two pages ) :

http://selfserve.northampton.gov.uk/nbc/report_it.html

As you can see we use streetview (if it's available) to report not
only the location of a problem within our town, but also capture the
image from streetview to allow our operatives to know exactly what the
person was referring to when they get to that location.

We're also working on it mapping out incidents of things, such as the
homicide map you linked to, albeit ours are for mundane things like
abandoned vehicles or fly tipping. One they are plotted on the map
above are then broken down into a league table based on the
administrative districts and shown in the left hand information
window.

KW

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