Gangaroo lets your search for pretty much any product on Amazon and other sites, click on it, write a review of it, and then the image, your description and your review will show up on a public list. You can make separate lists of books, DVD’s, music CD’s, etc. You can post the url address to your list and its publicly viewable, but only registered users can leave comments.
I’m adding Gangeroo to two “The Best…” lists:
The Best Places Where Students Can Write For An “Authentic Audience”
My Best Posts On Books: Why They’re Important & How To Help Students Select, Read, Write & Discuss Them