I made Xspf Music Player with Dopus and put on my "Korean dopus forum" front page. 
Here is my player. http://dopus.sixserve.com/do/dopus.htm
Very cool!
Very nice...
The link above does not work...
How did you do this, can you share the buttons? Thanks
A good idea, But I don't know how to handle it, The "Shuffle" and "Repeat" is a big question.
The shuffle can be done using "SelectEx" form tbone in scripts-section, but I would recommend using an ext. player (like AIMP), create a floating toolbutton being always on top and control the player via the toolbar (I included transparent icons for that in my S-DOX II IconSet). So it's accessible on every screen, but doesn't bother you (like most miniplayers/skins do).
How does the volume selection and progress bar get into the DO window?
I also have a layout, that mimics a full player (controlling winamp in the back), would be interesting to know about your tricks, as a lot of tricks are involved with attempts to use DO as a player interface (showing currently playing track, cover etc.).
I made a Random Shuffle button for Directory Opus 12, which may be of interest.