Sales Graphic via Google Maps

This might be beyond the scope of this forum, but I saw a site that had a map which displayed all the countries to which they had sold items. Does anyone how how to do something like that? It could be kind of cool and give your store some cred to your shoppers. It doesn't seem like it would be all that difficult to pull all the countries, or even cities as well, from your database and display them on a Google map. It obviously shouldn't have any sensitive information, but city and country could be kind of cool. Does anybody know of anything like this? Does anybody feel like taking a crack at it? I would love to, but am pretty sure that it's a little beyond the scope of my abilities.