Buxley's Geocaching Waypoint  
   Explanation of the sport, collection of recent news stories, maps of cache locations, a FAQ, and announcements of geocaching parties and events.
   http://www.brillig.com/geocaching/

Degree Confluence Project  
   A project with the goal to visit each of the latitude and longitude integer degree intersections in the world, take pictures at each location, and post pictures and stories on the website. (Not exactly geocaching...)
   http://www.confluence.org/

Geocache Rating System  
   Tool for helping geocachers rate the overall and terrain difficulty of their hidden caches.
   http://www.clayjar.com/gcrs/

Geocaching Geocoins Canada  
   Geocoins are numbered geocaching coins that are designed to provide geocachers with a collectable, tradable and trackable cache prize.
   http://www.geocoins.ca/

Navicache  
   Provides a wide range of information and listing resources for the geocaching enthusiast including worldwide cache listing service, forums, and chat.
   http://www.navicache.com/

The Maryland Geocaching Society  
   Geocaching related resources related to caching activities in Maryland. Site includes forums, chat, cache listings and coming events
   http://www.mdgps.net

Utah geocaching games  
   Variety of geocaching games in and around Utah.
   http://www.cachunuts.com

Geocaching Australia  
   Australian geocaching portal complete with links to forums, mapping tools and personal cache pages.
   http://geocaching.com.au

GeoSnapper - GPS Photography  
   Enables users to upload and distribute accurately geo-referenced digital photographs using a camera and a GPS receiver.
   http://www.geosnapper.com

GeocacheUK  
   Information and resources for UK geocachers including forums, chat rooms, maps and stats.
   http://www.geocacheuk.com/

Tampa Bay Geocaching  
   Resources for GPS enthusiats in the Tampa Bay, Florida.
   http://www.tampabaygeocaching.com

Georgia Geocachers Association  
   Includes cache events in Georgia, what's new, issues facing the GGA, discussion boards, as well as a resource section.
   http://www.ggaonline.org

North Texas Geocaching Association  
   Features news, articles, information on membership and activities, FAQs, links and contact details.
   http://www.ntxga.org/

Wisconsin Geocaching Association  
   Dedicated to promoting the activity through out the state. Features message boards, links, maps, membership information and photos.
   http://www.wi-geocaching.com/

St.. Louis Area Geocachers Association  
   Features information on the group, activities, discussion forum, links and contacts.
   http://www.geostl.com/

Michigan Geocaching Organization  
   Promotes geocaching in Michigan. Site includes, forums, news, downloads, and articles.
   http://mi-geocaching.org/

Geo-* - Linux tools for Geocaching  
   Provides free Linux software for the activity.
   http://geo.rkkda.com

British Columbia Geocaching Association  
   Portal to caching in and around BC. Promotes geocaching in BC by providing the resources such as News, Events, Downloads, Links, Recent Caches, and Fourms.
   http://www.bcgeocaching.com

The Groundspeak Forums  
   Includes discussions on general questions, geographical regions, adventures, and GPS related issues.
   http://forums.groundspeak.com/GC/

Oklahoma Geocaching  
   News, forums and event listings for cachers in Oklahoma.
   http://okgeocaching.com/

Colorado Geocaching Resource Pages  
   A summary of geocaching regulations in various Colorado public lands.
   http://home.earthlink.net/~rsgeek

North Carolina Geocachers Association  
   Promotes and enhances geocaching throughout North Carolina. Listings of geocaches, information about membership and etiquette.
   http://www.ncgeocachers.com