For those of you that keep a webpage or blog, Shelfari would be a good way for you to share the books that you would like to read, are reading, or have read. It will display the books on a virtual bookshelf. Your visitors can then hover over the book and get some information about it. When you click on the book it will take you to Amazon where you can of course get all the advantages of Amazon.
You could use this in your classroom by linking textbooks that you will use in your class as well as books that the students will be reading in your classes.
You can view the books that I want to read in the sidebar of my blog. Most are History by Howard Zinn, and the other is a book about teenagers and technology, "Digital Natives."