Uses Mootools or JQuery to create the accordion effect. This implementation requires no specialist knowledge. In addition by default it takes its styling from your existing template so that for most users there is very little to be done to have a great looking addition to your site.
There are text areas on the backend for accepting content in Joomla 2.5.x and Joomla 3.x. This means that you can cut and paste content or code rather than write complicated stuff for creating the accordion.
This was created using css and a minimal amount of added graphics.