Geokrety
From GeoWiki
Geokrety (gr. geo = ‘earth’, krety pol. = ‘moles’) is a service similar to TravelBug(TM) that allows you to track objects you leave in geocache containers. People move these registered objects (called GeoKrety) from cache to cache and register each move on the Geokrety.org website. The trip of each GeoKret is then presented on a map.