Tim Spalding has upgraded LibraryThing to include a few RSS feeds (151,440, to be precise) for its online catalog. Feeds include books cataloged by each LibraryThing member, reviews by each member, reviews of your books, all books given a specific tag, and reviews of books with a given tag. Phew! Tim has been busy.
This type of activity would be great for a traditional library — letting patrons see what other patrons are reading (assuming the patrons have opted in to the sharing of their reading lists). What might be interesting is to tell the catalog what it is you’ve read and then publish new books as you read them; others who have read the same books might be interested in receiving your newly-found books. This could even be done anonymously, if groupings of books read by the same people could be identified.