This belongs to the things I should have blogged about ages ago but keep forgetting. The idea for BookCrossing is to take a book and “release” it into the wild. The book is marked with the label below and the idea is that the book will travel around and if the original releaser is lucky then he/she will get email reports on were the book is.
Never heard of bookcrossing? It has even made the Concise Oxford English Dictionary as a new word.
A similar project is Phototag which periodically releases a series of disposable cameras into the wild. The cameras are labeled and have instructions for unwary PhotoTaggers to take one picture and pass the camera on. Postage and a return address are included on the camera so that it may simply be dropped into the mail to get back home when all the film is used up.