Letterboxing is a relatively new phenomenon in the United States, and therefore, there are only a handful of websites detailing the hobby. There are, however, a number of sites describing the activities of our friends in England. Here are links to sites for both sides of the Atlantic:

United States:

• Letterboxing North America
• Yahoo Letterboxing Discussion Group (very useful!)
• Letterboxing Central
• Letterboxing North America Webring

England:

• About Letterboxing: The Newest British Invasion
• Dartmoor (England) Letterboxing
• Another Guide to Letterboxing in Dartmoor

Here are some links on how to make your own rubber stamps:

• Letterboxing North America: Making Your Stamp
• Letterboxing North America Kid's Page: Making Stamps (this page has very good photographs)
• Der Mad Stamper's "How to Make a Rubber Stamp"
• Super Stick is a great double-sided foam adhesive sheet for those who like mounting their carved letterbox stamps on a wooden or plastic back. The site also has all sorts of rubber stamping supplies.

Then, there's Geocaching.com, which utilizes GPS coordinates in place of written clues, and foregoes exchanging stamps in place of exchanging small gifts. But, it's just as much fun as letterboxing!

Don't forget to adopt the "Leave No Trace" policy. One planet, one people....

And now, the fine print: Waiver of Responsibility and Disclaimer: Letterboxing, like any outdoor sport, carries the risk of various and unforseen hazards (including, but not limited to, deer ticks and poison ivy). The Perfect Circle Letterboxing Guild support a policy of not knowingly placing letterboxes in areas that will create undue risk to the letterbox hunter. However, as conditions may vary, it is the responsibility of the letterbox searcher to become thoroughly familiar with the conditions in the area to be searched, to adequately prepare for those conditions, and to conduct oneself safely and responsibly with respect to those conditions and with respect to his or her personal abilities and limitations. The Perfect Circle Letterboxing Guild and the individual letterbox sponsors assume no liability for events which may occur related directly or indirectly to one's searching for a letterbox. Do not let children hunt for letterboxes unsupervised. By reading and utilizing this letterbox clue, you acknowledge the above conditions, and accept responsibility for your own actions, and agree to hold non-liable the clubs and clue writers/box sponsors, and further, agree to provide this disclaimer to any person with whom you share these letterbox clues.