I'd be remiss if I didn't point out that there's a post on subject cataloging over on the Library of Congress Blog. It refers to an interview with Aaron Swartz about the Open Library. Again here's another example of the Web 2.0 crowd's interest in quality bibliographic data (I've mentioned this before.).
I'm encouraged by Web 2.0 projects like Library Thing and the Open Library. Read the interview and the LC blog post and let me know what you think.