Continuing with trend sparked by Google Instant, ShelfLuv is an instant search for Amazon's bookstore. It can help you find new books faster (and look good doing it).
ShelfLuv's instant search creates an instant bookshelf for you as you type:
Click to enlarge.
If you find a book you like, just click on it and ShelfLuv will give you a nice close-up of the details like author, ratings, edition and sales rank. From there you can buy through Amazon or search for something else. It's a simple, nice and fast way to look for books.