Letterboxing

1. Letterboxing is an outdoor hobby which began on the moors of Dartmoor England. Letterboxers hide a small weatherproof box in publicly accessible places and post clues to its location. Traditionally, the clues are left in known letterboxes, but also on the Internet. Interest in letterboxing in the United States is generally considered to have started with a feature article in the [April 1998] Smithsonian Magazine. Anne Swinscow has written several popular guide books, e.g. Dartmoor Letterboxes ISBN 0950911429 (amazon.com, search) [Amazon UK]

See Geocaching, Orienteering

US Club at http://www.letterboxing.org

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2. "Letterboxing" is also a term used to describe the process of transfering a widescreen image to video in a widescreen ratio, described here.