Books in the Wild.

Way fun:

The Books in the Wild programme is an innovative book-sharing initiative targeting year 9 and 10 students.

Popular teen book titles will be left at locations around the city, including schools and indoor public areas.

Students are being challenged to hunt them down, register online and make comments before leaving the books in similar places for others to pick up.

Like BookCrossing, but with a target audience.  The website is here.