I am using it as a sort of mini database application.
Say you are a web developer and have references to your pricing all throughout your site. Write an article with the content: "my standard development fees are X per hour" then use content include to insert that phrase whenever you need it on a page.
Rates go up? Just change the original article and boom - your site is updated with your new rates...
The developer even made a custom modification for me. These types of components and dedicated developers are what make Joomla number one in my book.