A searchable database of copyright renewals for books published in the US between 1923 and 1964 is now available, online, at Stanford University's Libraries and Information Resources Web site.
On August 10, 2006, the Berkman Center for Internet & Society at Harvard Law School released Research Publication No. 2006-09, The Digital Learning Challenge: Obstacles to Eductional Uses of Copyrighted Material in the Digital Age.
Authored by Berkman Center Faculty Director, William W. Fisher and Berkman Fellow, William MCGeveran, the paper reports the results of a year long study conducted by the Digital Media Project at the Berkman Center. Drawing on research, interviews, and participatory workshops the Fisher and MCGeveran identify four main obstacles to the use of copyrighted works in education. You can download the paper, without charge, at the Berkman Center's publications site.