.Each bookmarklet is a tiny program (a JavaScript application) contained in a bookmark which can be saved and used the same way you use normal bookmarks. They allow you to perform a variety of useful functions on any html page you have surfed to, e.g., change the font, read the cookies the site has passed to you, zoom, autoscroll, get the last update time and lots more. (OK, so they're only shell extensions if you buy Bill Gates' assertion that IE4 is now part of the Windows shell, but they're so useful!).....(freeware).....