Thanks to the following tip from kami68k:

An MDX Player for the PSP appeared, its made by BouKiCHi:
http://clogging.web.fc2.com/

more about MDX:
http://en.wikipedia.org/wiki/X68000%27s_MDX

And on a sidenote, Naruto has announced a new Sound Driver for the Sharp X1 (why is everyone doing new Soundrivers lately?)

There is nothing to see yet though:
http://www.rootnyanplus.com/user/naruto/