Nice Idea!. I'm in...
Some quickies:
Dynamic Card background and Icons, and Customizable Page where the Zune card is hosted.
How about a 'War of the Bands' contest. Every month Zune picks two bands and people in the Social vote for their favourite, winning team gets to choose next genre to play, or something...
Games on Zune device could trigger more Social functionality, like keeping High Scores of Gaming preferences...
T&R,
DS.
DS-BA,
Using Zune from Buenos Aires, ARGENTINA.