Tag and Release Sites

I just stumbled onto Photochaining, where you can leave a camera memory card with photos on it somewhere for a stranger to find, hoping they will follow your instructions, leave it for a subsequent stranger, and so on. This got me thinking about similar “tag and release” style sites or projects, like:

• Geocaching
• Disposable cameras on park benches
• Bookcrossing

So I started a thread on Ask Metafilter, and will repost examples here (and anything else I find):

• Letterboxing
• The 1000 Journals Project. Interestingly, one of the related links there, www.1000journals.com, gets flagged as an “attack site” by Firefox.
• Where’s George? (US), Where’s Willy (Canada), Canadian Money Tracker, and Australian Money Tracker.
• Postcrossing
• The Great Internet Migratory Box Of Electronics Junk (see also the tgimboej flickr tag).
• Tim Knowles' Spy Box.

Semi-related and very cool, but no real Internet and/or feedback component, so I’m not really counting them:

• Leaving personal secrets inserted between the pages of PostSecret books in bookstores and libraries.
• Leaving mix CDs behind in Zipcars.
• Time capsules and messages in bottles.
• Carl Sagan’s plaque (jury’s still out on the feedback aspect).