Today, I created a Google Reader account to collect RSS feeds. I took the library group and, after reading some of the entries, I narrowed my selection to: Information wants to be free; Librarians' Internet; Library Stuff, Tame the Web; Stephen's Lighthouse and the Shifted Librarian. I'm not entirely sure that these meet my needs, but need time to evaluate them.
I can see a school library using RSS feeds to introduce new books; notify teachers of new materials. A public library might be able to notify about overdues or holds