Hopefully you saw our sneak preview of MetroRadio, the first unofficial Pandora app for Windows Phone built off of the Metro Pandora SDK. That app is now live in the Marketplace, having successfully cleared the Marketplace guidelines. From the app description:

"MetroRadio is the first Pandora 3rd party application on Windows Phone 7. The app has all the important features from Pandora, such as: Streaming stations, liking/disliking songs, making new stations, album art, and many more... This app is Mango optimized; it will run in the background. This app will be updated periodically, introducing new features such as pinning stations, auto login, etc..."

This is obviously big news for our platform and while not a perfect solution, it certainly is a start. You can find MetroRadio here in the Marketplace for free. Let us know in comments your initial thoughts!