Carpe Librum bookstore used to be a pop up bookstore, now permanently housed at Farragut Square. Great lunch break if you work in the area. You can donate books or purchase books, the proceeds of which go to Turning the Page, a great organization that provides educational resources to public schools. The book selection, CD, and DVD collection of course depends on the donations. In terms of books, there is a good mix of classics, politics, history, cookbooks, sci-fi(definitely bought all LOTR for $ 4).