I still can't figure out exactly what the problem is with the sourceforge media player and xspf files. However, I did write a PHP script that will allow me to store all of the xspf list attributes of my song lists in a MySQL file to be used for creating the xspf file. With modrewrite enabled you can then serve the file as .xspf instead of .php. I have not integrated it with content management. But that would be the next step. I think this would make a great XOOPS module. Problem is the media player snag on using my files for some reason.