I’ve been visiting AllConsuming.net from time to time. It’s a website which shows what blogs have been talking about what books. You can see the most commonly mentioned books, or look up a book and see what blogs have mentioned it. If you mention a book in your blog, you can trackback to the page for that book so that someone else can find your comments. It’s a really handy site if you are a reader, and will only become more useful as more people become aware of it.