Allows administrative users to save geolocation data for an individual item. The plugin generates a Google map containing items with geolocation data and a web page for displaying the map.
OpenStreetMap's default map tiles are now one of many options for the new Leaflet-ized version of Geolocation (along with many others that use OSM data).
I haven't had time to study plugin's code and don't know if it's trivial or not, but it would be nice to add support for openstreetmap maps.