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I'd love to see a concept like listal paired with modern technologies. The idea that strikes me first are pairing it with something like google goggles for data entry. Being able to just take a picture of the cover of a book and having all the isbn information added automatically would be fantastic.
Write it yourself. All you have to do is paste these two things together.http://zbar.sourceforge.net/https://code.google.com/apis/books/
update: the most owned book on the site (Harry Potter book 6) is only owned by 1146 users. I'm reading that as "this service has very few people on it."