Rated 5 out of 5 stars

http://wordplayblog.com/zemanta-delivers-free-images-keywords-and-more-to-your-browser/

Excerpt:
For those who haven’t heard about it, Zemanta is a plugin for Mozilla Firefox 2 and 3 that can be used with WordPress.org, Blogger or Typepad. (This is yet another reason to use the vastly superior Firefox browser. A version of Zemanta also is in the works for Internet Explorer though. You can e-mail Zemanta at info [@] zemanta.com if you’d like to become an IE beta tester.)

This review is for a previous version of the add-on (0.2.5).