british library integrated catalogue (Score 2, Informative)

While we're talking about the British Library, it's worth mentioning that they've just redone their catalogue search facility, and it is now excellent (and it works in FireFox). You can search their entire copyright library for free here:

http://catalogue.bl.uk/

You can even use the site to order offprints of articles, book chapters, etc. from their Document Supply Centre. Very, very handy.