Kent Fitch and Alison Dellit presented an interesting paper at the recent NLA Innovative Ideas Forum on Rethinking the catalogue (4.4 MB PPT).  In the presentation Kent talks about the need to integrate library catalogue searches with remote full text sources and shows a mockup that he developed to try and address this problem. The mockup, in the form of a static demonstrator, is available here

The recent discussion on Lorcan Dempsey's weblog on the topic of digitised book content is also interesting.