JD_Toims - 10:30 am on Sep 19, 2013 (gmt 0)
Not sure about the HTML4 reference -- The recognized/accepted media types are actually defined by CSS.
Here's the most recent list of types, which happens to be the same as the one Lucy24 posted [CSS3 -- the one I linked -- is not yet the recommendation]. Notice the lists in CSS2.1 and CSS3 are not exactly the same as the list linked from the HTML4* docs:
* The HTML4 documentation links to a list of types with Aural and without Speech or Embossed -- http://www.w3.org/TR/html401/types.html#type-media-descriptors -- but Aural has been deprecated and Speech + Embossed have been added since at least CSS2.1 (June 2011)