At my building we have a tradition of leaving them in the laundry room. There's a bookcase and a couple of chairs in there, and frequently someone will start a book while waiting on a load and take it when they're done washing.
It's interesting to see what lingers, what disappears quickly, and what my neighbors are reading. There's a book I left called "The Wrestler's Cruel Study" that's languished there for over two years. Someone recently left 5 or 6 books on achieving female orgasm, and I don't think I saw them on the shelves more than a week.
