There’s a cool bookmarklet that lets you search Amazon for a book then look up the book at your local library. The <a href=http://www.ci.cambridge.ma.us/~CPL/”“>Cambridge Public Library</a> wasn’t supported in the list, but it was close to the first one. It was easy enough to change the bookmarklet to make it work though, as all it does is pass the ISBN of the Amazon web page you are viewing to your library.