Spotify is really well done : the client is lightweight, launches fast, is responsive, when you double click a track to play it starts playing instantly (it really feels like the file stored locally), and the catalog is impressive (although about 1/3 of the stuff I listen to isn't in there yet).
Here in France they have a competitor that is already very entrenched : deezer.com. If you go a party at someones' place, you will ALWAYS see a laptop in a corner with Deezer playing stuff. People walk up, search for what they want to hear, and it plays. Simple. Of course, Spotify is miles ahead of Deezer in terms of technology and user experience. So I hope they don't get squashed by the virality of Deezer.
Here in France they have a competitor that is already very entrenched : deezer.com. If you go a party at someones' place, you will ALWAYS see a laptop in a corner with Deezer playing stuff. People walk up, search for what they want to hear, and it plays. Simple. Of course, Spotify is miles ahead of Deezer in terms of technology and user experience. So I hope they don't get squashed by the virality of Deezer.