One I consider to be one of the best add-ons for IE has been updated. IE7Pro 2.4 was recently on September 24th.
  1. <LI>Add Grab & Drag Function
    <LI>Modify the installation package
    <LI>Added support for add to bookmark in Mouse Gestures
    <LI>Fix some bugs
In spite of its name it also works in IE8 beta 2, and in IE6 with reduced functionality.