Travelling the library blogosphere at the speed of light, a study by the ALA showing law enforcement interests in library records:
Based on the survey findings, ALA believes that public anxiety and librarian concern over law enforcement activity in libraries is justified. Survey results indicate a total of at least 137 legally executed requests by federal and state/local law enforcement in both academic and public libraries have taken place since October, 2001-63 legally executed requests for records in public libraries and 74 legally executed requests in academic libraries.
This article has a good overview of the context for the study. Apparently, the data for the ALA study was housed on a Canadian server … “beyond the reach of U.S. authorities”. A big Canadian welcome to all PATRIOT Act dodgers out there…