Real Time Check-ins Map
This Google Map displays in real-time the locations of Foursquare check-ins shared via Twitter.
The map displays the locations of the latest check-ins made to Foursquare. If nothing else the map is interesting in that it gives a rough guide of Foursquare's penetration around the world. At the moment Foursquare appears most popular in North America, Europe, South East Asia and Japan. However Foursquare seems to have made little penetration in South Africa.
Another potential use of the map could be to zoom in on your current location and check-out who is logging in on Foursquare around you.