ClustrMaps is one wicked visitor counter. It actually shows from where the visitors came on the mini map.
Click on it, and you get the bigger view of the map, like below
Register it, and you will get more features, like allowing you to have up to 100,000 visitors daily, getting a large map that you can zoom in into each continent and stores an unlimited archive of old maps.
Will I upgrade? Mmm. Let’s wait a while first. I just want to see how realiable the service is.