Basically one could say QMP is QCD with a media library. But there are, of course, other features that have been added.
New features include :
  * New Default Skin
  * ML : Shoutcast and Icecast Internet Radio Listing
  * Video Playback
  * new Preference UI
  * Pruning Mode
  * Skin Color Changer
.
.       more...
.

Furthermore the program core and the ML have been rewritten several times.