We've had requests from several clients for a simple way to add effects to their pages, e.g. to allow a button to toggle open or close additional paragraphs of information.
So we've created a simple Javascript Library called Gutensite FX, based on the Mootools Library that is already running on every site. If Gutensite FX is enabled, you can add a CSS class to any element, and it becomes a toggle button. Add another CSS class to any other element, and that becomes the area that opens or closes. It's that simple.
We only have a couple simple effects in Gutensite FX for now, but we plan to add more later. Now that the framework is created, adding new effects would be simple.
See our Gutensite FX How-To on the subject for documentation and examples of how to implement this on your own site.