After reading about the "Zune" I found a good concept that would actually work if Microsoft didn't screw it up.
The problem: The Zune is based on what songs you want to send, not what songs you want. What does this mean? If you are sitting at a coffee shop and you there are other Zunes around, the only songs you can get is what people send you, which is stupid.
It should work the other way around. iTunes already has the concept for home networks, in the Share iTunes Library. Basically the iPod would do the same, allowing people to leech off your library songs THAT they want, not songs that others want to send them.
The other thing that Apple can get right is by making it much faster by using 802.11n.
And the other killer would be to offer an add-on to make every iPod already in the market have the feature.
I know I'll take some heat for this post but I just believe that the concept if done right could work!