Book Burro: Cool Web 2.0 Tool

Book Burro is a Web 2.0 extension for Firefox and Flock. When it senses you are looking at a page that contains a book, it will overlay a small panel you can open to see prices at online bookstores AND whether the book is available at a library close to your home.
By entering your zip code, Book Burro uses Open WorldCat’s web service to display local availability. For more information on how it works, see the blog.