One of the best plugins for sliding panels, but …

… the style could be a bit more modern concerning for example the behaviour (jquery) and the opening/closing button.
But the extensive possibilities of settings are really gorgeous, especially that you can add your own custom widgets to this panel areas.

However the plugin has a big disadvantage:
as soon as you de-activate it (for example if you need to search for plugins conflicts), then all your custom settings, that you have made through the plugin’s option page, are lost for ever ??