We use it.
Meals on Wheels Embedded Map
Clients, caseworkers and volunteers need to find who their local program is, so they use this map (or they follow a link to Google Maps so they can enter an address - this feature is not embeddable yet).
Our programs are not divided by any pre-existing borders (cities, zips, etc) so i created polygons for each program and put their contact info in the info bubbles.
Without the 'enter address here' search maps field, the map is not as functional as i hoped. Also, it does not consistently work, the polygons do not always show up, and when someone does go directly to the google maps and enters an address it doesn't work at all anymore...
it is an on going time-consumer for me