BookCrossing is defined as "the practice of leaving a book in a public place to be picked up and read by others, who then do likewise." The term is derived from bookcrossing.com, a free online book club which began in order to encourage the practice, aiming to "make the whole world a library."
BookCrossing.com has a great deal of data on book ratings across genres and geographies and basic demographic / geographic information (location and age). At present it has no recommendation systems in place (other than a naïve rule based on the number of users reviewing a particular book and average rating).
The project aim is to use BookCrossing data to suggest a recommendation system for new and existing members of the site.