Some NAS boxes include an iTunes Media Server - which I understand is music only.? Does remove the issue of a PC (and any login problems).?
I don't know how they cope with itunes home sharing - that's the pain of the ATV of course. XBMC on the other hand gets around this but you're stuck with the jailbreak issue.?
Neither.? That said I'd probably rather use XBMC or plex for music.? Or Keep iTunes on a server (which I kind of do now).
How do you set up your iTunes? Apple need some sort of family account (like 5 users max that can be associated to each other), something which shares all purchased items with everyone in the same home, but more seemless than whats on offer currently.