Over at SOA pit stop, they found a very interesting find that I didn't even know existed.  Some hidden Zune API's you can develop against.

They mention there are a few objects you can get to.

• ZuneLibrary
• ZuneQueryList
• ZuneQueryItem

Which lets you do stuff like

• QueryDatabase
• GetAlbumsByArtists
• GetTracksByAlbum
• GetTracksByPlaylist

So you can do this AND develop games for your Zune with XNA!

Source:→ MSDN Blogs

Microsoft, Zune, API