OCLC has released its top 1000 titles owned by member libraries. The top 10 and a link to the entire 1000 titles is located here: http://www.oclc.org/research/top1000/default.htm . There is an additional link on the right side of the page for subject categories such as banned books, and librarianship, but this user could access only the first four categories due to bad web links.