Yesterday we broke the news of the first Pandora app for Windows Phone called MetroRadio. Built off of the public SDK for Pandora by Justin Angel, developer Mustafa Taleb (see his other apps) has been quickly working to get to this app to the Marketplace. We now have our hands on the XAP file for this sneak peek.
Keep in mind, the app is still in development so this isn't the final version. Overall though, it works as advertised bringing down your radio stations, allowing you to add and rename stations, like/dislike and skip-track. It's a bit vanilla in design, but clearly these are things that can be addressed in later versions. Being a full Mango app, it of course uses the Zune controls and plays in the background.
Not bad at all for an early attempt and assuming it gets past the Marketplace, it should fill the void many are feeling with no official Pandora application.