Some people come up with the most incredible ideas! BookCrossing is a site where you can register a book you want to “release”, you give the public location where you will leave it. People find the listing on the site and go get it if they are interested. Dont know how it actually happens in the real world, if you can really find it before someone random picks it up but what a great concept! Currently 193 books listed in Montreal. Some people are also using the idea and site to exchange diaries in which every person who gets it adds their own entries. this one has been to various european countries.