When I select "Hosts World Map" from the ntop web interface, I'm presented
with an error that my Google Maps API key has been rejected.  I've visited
http://www.google.com/apis/maps/signup.html and generated a key for my site,
but I'm not sure where to store it.  After a lot of Googling, I found:
  http://www.ntop.org/trac/changeset/3640
  http://www.ntop.org/trac/ticket/61
  http://lists.ntop.org/pipermail/ntop-dev/2008-November/007117.html
I created a file named google_maps.key under /usr/local/var/ntop, stored my
key in it, chown ntop:staff google_maps.key, chmod 640 google_maps.key,
restarted ntop, but still get this error.  Should the key be in that file?
Shold it be in prefsCache.db? (if so, how do I get it in there?)

Many thanks!

- Ken