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

Yes, but not from Google
Example
http://www.census.gov/geo/www/cob/co2000.html

> The LA Times, for instance, has a really amazing (if not depressing) homicide 
> map, where at certain zoom levels, it shows only circles with the number of 
> homicides per, what I assume, are neighborhoods.

It is possible to get that kind of effect without any knowledge of
boundaries, see clustering example
  http://blog.fusonic.net/archives/195
but obviously may not suit all purposes.

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