Check out this post within the Zune forums: it's a chance to co-develop a feature with the Zune Social team. Specifically, a fun activity or game within the social – like a music trivia or theme song (TBD). Here's a quick blurb from the Program Manager heading up the project:
I’ll provide initial concepts and ideas in this forum dedicated to developing the feature, and we’ll go from there. Together, we’ll develop the concept, user scenarios, and then the feature functional design. We’ll still work with our internal product designer to come up with what it actually looks like, and our software developers and testers will write and test the code. But you’ll be seeing it at each step of the software development process.
Want to participate? Provide input? Want more details? Head to the forum and read more.