Spotify is a service that, according to their own description, allows you to listen to "any track you like, any time you like". Together with Microsoft, Spotify have launched the Spotify client for Windows Mobile devices.
It is for Windows Mobile 6.x — basically, the latest version of the platform since Windows Phone 7 is not even out yet — and it looks to be the last one in terms of support for platforms after iPhone, Android and Symbian. The application allows you to listen to the tracks of your choice, access the playlists, stream music over WiFi or data as well as play in offline mode.
To get your copy, direct your Device's browser to m.spotify.com and choose to download or alternatively download it from Marketplace. There's one downside to the service though: using a mobile client is allowed only if you have a Premium account and the service is currently working in countries like Finland, France, Norway, Netherlands, Spain, Sweden and United Kingdom.
(Via: TechCrunch, thanks Johan N.)