[ Apologies for cross-posting ]

LibraryThing just released a free, CC-attribution-licensed Web
Services XML API to our "Common Knowledge" system, including series
data, fictional characters, author dates and much else. I'm
particularly stoked about the series data. I think it's of exceptional
quality, suitable for use in OPACs (eg.,
http://www.librarything.com/series/Star+Wars). Anyway, in a catalog or
not, there are a lot of cool things to do with it.

Have fun!

http://www.librarything.com/blog/2008/08/free-web-services-api-to-common.php

Tim
-- 
Check out my library at http://www.librarything.com/profile/timspalding