Nah... I don't think there's one that lets you control the Zune application yet... I seriously expect Microsoft to fill this gap with an official application or integrated into the OS itself.
I don't like them touting this "Music Everywhere" when you can't even control your Zune software or Zune player on Xbox 360 with your phone. That's great, they have their "3 screens and the cloud" ready... but there is much room for improvement when it comes to integration.