Did you know James Joyce wrote a children's book (sort of)? Patricia Highsmith wrote one too. So did James Baldwin (not to be confused with James Baldwin the children's book author). Eugène Ionesco wrote four stories for young kids. Graham Greene also wrote at the very least four children's books (and possibly more). Other unlikely children's book authors are Aldous Huxley, E. E. Cummings, Chinua Achebe (2, 3, 4), Eleanor Roosevelt and Gertrude Stein. Author Ariel S. Winter has written about all these books on his excellent blog We Too Were Children, Mr. Barrie. On his Flickr page you can look at scans from these books, sometimes even the whole book.
BBC World Service has over 500 audio documentaries you can download. The subject matter is incredibly wide ranging, for example, internet cafés, the influence of Islamic art on William Morris, South African female AIDS activist Thembi Ngubane, Yiddish, the importance of cows, novelist Chinua Achebe, financial risk management, Obama as an intellectual, the physical and emotional effects of a car crash and many, many more. If the quantity and variety are overwhelming, you can subscribe to a podcast, which delivers a new documentary to you every single day.