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Google has added some new features to its Book Search today.
With the new features, Google gives you for book results are the ability to add it to your library, write a review, buy it from various online retailers or borrow it from a local library. These are features we see in various networks like Shelfari and more recently BookConnect. Some books offer limited preview options, while others have a full view, and this lets you read the book's text online.
There are website and individual reviews you can check out with the book's additional details, as well as other web references, related books, other books in that particular market segment, and other editions. Now there's also references from other books and scholarly works that can be found in book details, which brings another level of connectivity for the books you're finding online. This means that a quote can literally be "followed" through all the books and documents it appears in.
There's also now a way for you to copy and embed parts of public domain books, which is a nice extension of the references tool. This makes it easy to share quotes from a book on your blog or website, and sounds like it's along some of the same lines as a sharing tool that Google has insinuated with one of its patent submissions.