I guess most of the web developers know what it is. But how about the users? Last week, we recorded a tutorial video to teach our user how bookmarklet works:
http://www.ajaxime.com/~wonghang/video/IE7.htm
http://www.ajaxime.com/~wonghang/video/firefox.htm
http://www.ajaxime.com/~wonghang/video/opera.htm
By default, IE7 does not allow the user to drag and drop a link containing JavaScript. As you can see, it is quite complicated for a IE7 user to install our Bookmarklet. I demonstrated the IE7 bookmarklet video to some users and got some comments from them. They thought that setting lower security level and adding our website on trusted site was not a good idea. It is because the user have to click a lot of buttons and he also thought that we were doing something harmful for them if he had to add our website in trusted website list.
We agree that it would be better to write a very small program to install the bookmarklet (or a toolbar) for IE users. Although installing a binary executables is much more harmful than installing a JavaScript bookmark, the user seems to be feel more comfortable than installing a bookmarklet.
Of course, we will improve our Bookmarklet Tutorial Video. Maybe we will add human voice and subtitles in the near future.