...Book Search (the former Google Print). In Googles blog post announcing this, Google mentions they already partnered with several online book sites who use their widget-style preview functionality " like this BooksaMillion.com page which shows a Google preview button. Clicking the button opens a box which lets you page through parts of the book, search, and zoom.

To embed a book preview, all you need to do is write a bit of JavaScript which retrieves a book by e.g. its ISBN (International Standard Book Number). You can determine basic things like width and height of the box, but also offer more advanced behavior like automatically paging through the book. You can also access Googles Atom-based REST page by searching, for instance, for a title " the retrieved Atom may allow you to grab the thumbnail URL, a book description, its ISBN and more. Furthermore, you can connect to Book Search community features like ratings, labels and reviews.

Note Amazon also offers a book search API and more

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