Geocaching - Your go-to resource for all things geocaching.
National Geographic - Definition of geocaching, popular vocabulary, and articles all on geocaching.
REI - How to get started geocaching and how to create your own cache.
Geocaching - Discover the orgins of the hobby.
Everyday Carry - 100 must have geocaching essentials.
Run Wild My Child - A beginner's guide to geocaching with kids.