This is a list of the most commonly used media types in the world. http://static-content.springer.com/image/art%3A10.1186%2F1471-2105-10-26/MediaObjects/12859_2008_Article_2756_Fig5_HTML.jpg
http://static-content.springer.com/image/art%3A10.1186%2F1471-2105-10-26/MediaObjects/12859_2008_Article_2756_Fig5_HTML.jpg