Shelfari widget has been greatly popular since the first day we released it. Bloggers love its sleek look and the ease of installation. Today we made the widget even better. When your blog visitor hovers over a book in the widget, she’ll see a popup with your review of the book, your rating and the associated tags. If the visitor is on Shelfari she will also be able to add the book to her shelf with the click of a button. And even better, if she purchases the book through your widget you’ll get commission from Amazon, providing that you entered your Amazon Associate ID in the widget wizard. I hope you like the changes!
If you don't have a widget yet, you can create one from http://www.shelfari.com/widget.
PS. You can turn the popup on and off from the My Widgets page