I've been looking at Amarok recently any liking what I see, but ever since my girlfriend updated her computer to iTunes 7 I've been unable to access her shared music.

This is a known problem, caused by Apple changing the authentication hashes (again), and I would guess that if it is reverse engineered again, that Apple would pull the same trick next time too.

My question is about stepping out of the cat and mouse game altogether. Does anyone know of an alternative, cross platform method of sharing music?

I have done some lightweight googling, but the results are either DAAP or full p2p apps, neither of which is what I'm after. I also know that if she downgraded to iTunes 6 it would start working again, but I'd like a better solution all round.