Geocaching is a treasure hunt game in which the participants use a GPS receiver to hide and seek containers (called "geocaches" or "caches").
Geocaching has now been picked up by Hollywood. A new movie, called Splinterheads, hitting screens in November, contains a plot that revolves around a geocaching adventure,
The largest geocaching website is Geocaching.com with hundreds of thousands of caches. The website includes about 904,000 caches in over 200 countries around the world.
Geocaching uses Google Maps to show geocaches that can be found around any location.
GeoJournal is the first application of it's kind written for the Mac to manage your Geocaching adventures. It's got a ton of great features that allow you to plan, manage, and record all of your geocaching adventures.
Drop.io is a file sharing / storing site that allows users to store and share pictures, videos, audio, documents etc. without having to register or give an e-mail address. Drop.io utilises Google Maps so that users can add a location to an uploaded file. Adding a location to a virtual file can help users create a geocaching event.
GeoCaching Without GPS
A Wired article explaining how to take part in a geocaching event using Google Maps without a GPS unit.