Allows you to set some text inside the shortcode content so that it is shown as text rather than WordPress processing it as a shortcode. Good for developers of shortcode plugins so they can give examples of the code without it being rendered and it can also be used to talk about shortcode plugins.
I origionally made this for myself as the developer of the Flattr Shortcode Widget to be able to give examples of how to use the plugin on my wordpress blog.
To use the shortcode disabler, put the test you wish for shortcodes to be disabled on as the {content} variable of this shortcode:
[sd]{content}[sd]