Read and Release...

BookCrossing.com was launched in April of 2001, extending the useful life of books by encouraging readers to leave them in public places, in the hope that whoever finds them will read them, enjoy them, and release them again. The unique feature of BookCrossing.com is the ability to track a book's journeys via onsite registration. Read the full story by Jim Regan in the Christian Science Monitor... A similar site for currency is Where's George?, which lets you track dollar bills.