OpenType opens up a whole new world of typography options from the mundane to the super fancy. Silverlight's support for OpenType is excellent, supporting all the major features that a developer or designer could ask for. While they won't be used in every application, you'll find yourself able to use many of the features, especially variants and fractions, in business applications and more design-oriented applications alike.The text system always renders text using the specified font, a specified fallback or a default fallback if unspecified or if the font is unavailable. If the font you're using in your TextBlock or other control isn't a standard font, you may want to consider embedding it with your application.