Zune API has been out there for a while – I documented it on Coding4Fun and even created a centralized project with all the known API calls. I like to keep track of my Zune progress, and I like the Zune Card.
I implemented the exact copy of the Zune Card that can be used in a Windows Phone Silverlight Application project. The control is a part of the Windows Phone Control Kit and is called ZuneCard. The only property that needs to be specified at design time is UserID – the Zune tag (conveniently, it is also the Xbox Gamertag, if you have one).
You can download it on GitHub.
WARNING: The control is currently in testing stage. More functionality will be added and optimized. Use at your own risk.