Has anyone used this Bookcrossing? I like the idea but can see there could be all sorts of problems, like people chasing after you saying "you've left your book behind!" or the cafe (or wherever) refusing to allow you to leave a book there, or the book is just taken and not logged on Bookcrossing, or just thrown away.
I've probably talked myself out of registering with bookcrossing now, so I'd like to hear some positive tales, please :)