It has been suggested multiple times, so it actually becomes time that we organise an open library day. We have over 30 books that we already share among people that pass by the house, but this pile has grown so much lately that we don't have enough bookshelves anymore!
For this friday (which also happens to be my birthday - sweeet!) we'll have an open casa-day, especially for people who want a new book while traveling, who want to swap their book or who want to bring home-made cookies :)