For journal RSS feeds, tictoc has been doing work to create an api. As a stop gap they have created this http://www.tictocs.ac.uk/text.php
Also, http://jopml.org/ is a rails app which uses the data above to allow a user to search for journal titles matching a term, and create a opml file based on the seatch results. Dunno if it could be of use.
How about the Yahoo! User Interface Library (YUI)? I've recently been trying to create a carousel, with a view to showing book covers (e.g. most popular, new additions) but have so far been unsuccesful :o(
There is also a page that lists some of the mashups mentioned in the workshop at http://sites.google.com/site/elag09mashupworkshop/ - this includes one I particularly liked which enhances CD information in a catalogue with information from Last.fm