Wow, totally forgot about this.
been trying to work on a few things, I started the netmd-dev mailing list and the libnetmd project.
these are for the NetMD product line that Sony started with minidisc's. They allow for USB transfer to a MD player, plus other levels of control.
We currently cannot download tracks, but can do the full array of track editing features.
I'm also working on a kernel module to allow USB URB sniffing to help future USB developers out.