Services | Google Map API
Google Maps can be embedded on your web site.
Google supply an API to allow easy integration making use of your data in your database.
Have a look at the links on the happygolf website that makes use of googlemaps.
-- Happygolf accommodation provider
-- Pitreavie Golf Club
-- UK map with golf clubs, tournaments, passports and accommodation
The Q Guild of Butchers also make use of google maps API.