This is an experimental bookmarklet which lists the jQuery plugins being used on any page. Try it out now:

Detect plugins

To save the bookmarklet simply drag the above link to your bookmarks toolbar. It’s been tested successfully in Opera 9, Safari 4, FF2/3, IE6/7, and Chrome.

The list shown includes google links for each plugin; obviously not all plugins on all sites are available to the public so the links aren’t always very useful.