I've ripped MIDIs from Wario Master of Disguise that could be useful to the more musically inclined. However, they're not cleaned up and a lot of instruments don't correspond correctly so you'll have to clean them up if you want to use the MIDI files directly. Check them out in the resources page.
I've also put up a few random WarioWare Touched themes to drum up some interest maybe. I'm not sure if I'll continue this or if someone else might want to take over.