Bookcrossing

From Sharewiki.org

Bookcrossing is a worldwide movement to share books. Bookcrossers leave books in places for others to find them - for free, of course - and go hunting for books themselfes. The books can be registered on a website to track their way.

The idea has been ported to CDs: Meanwhile there is also CDCrossing.

See also: Droplifting