If you have an Airport Express you have to get Airfoil. The app lets you stream music from your Mac to just about anything that receives a wifi signal, including your iPhone, a Windows or Linux box or even the AppleTV. You select the source application and activate the destination speakers and off you go!
Forget iTunes Music, forget Amazon MP3. Spotify is revolutionary.
When I first installed the free app I was underwhelmed. Another iTunes clone, I thought. But as I dug around Spotify I was more and more impressed. It lets you instantly stream any music you want, for free. You can also create collaborative playlists, and by collaborative I mean other people you share the playlist with can add tracks and it all streams, again for free. I also like the fact that Spotify is platform agnostic… Mac, PC or Linux. Just download the app, click on the link your friend sent and listen.
I know Spotify mimics some of Last.fm‘s features but to me it feels more complete. If it keeps going as is, I don’t think I’ll be buying much music from iTunes.