Since 1982, many libraries in the United States have dedicated the last week of this month to recognize how fortunate we are to have the freedom to read. The American Library Association observes Banned Book Week from September 26th through October 3rd, 2009, and encourages us never to take for granted our freedom to enjoy literature, information, and ideas.
Many of the books we're used to seeing on library book shelves were at one time considered unsuitable. They were "challenged" based on political, religious, or sexual objections. Sometimes books are challenged or banned because the cultural standards accepted when the book was written no longer seem appropriate.