The popular plugin from RocketTheme which allows you to implement typography easily, without fear of the WYSIWYG editor ruining your formatting and allows you, and/or your clients to add them to your content with ease. This is through a method similar to BBcode (as seen in a forum). WYSIWYG friendly syntax can be used, or even custom configured that will transform a set snippet to the correct HTML when it is parsed by Joomla.