The Shifted Librarian has a post on using RSS in library catalogs.

Among the things she reports are some excerpts from an upcoming article on integrating internet content:

"At the National Cancer Institute (NCI) of the National Institutes of Health (NIH), Behesda, MD, we have used RSS both to integrate Internet content into the NCI library system and to make content from the library system available on our intranet in the form of RSS news feeds. This new content makes our library system a more useful and timely resource, allowing us to better 'feed' the information appetites of our clients, whose jobs require that they keep up with cancer and healthcare news, events, research, and politics. After the initial investment of time and technology, the information flows without requiring hands-on staff effort....