Use the free version of Spotify? Worried about the streaming limitations kicking in after six months? Guess what? Good news! The company decided to extend free and unlimited streaming for everyone. How long the company won't say, but if you've been holding off on paying for the service, you can breathe easy for a bit. [Spotify]
Meh, go with Rdio. You get free streaming with no ads (limited streaming time per month), a browser based UI instead of having to download an app (although they have one if you want), and much better iOS/Android apps including an iPad app.
I wish Spotify hadn't taken off so much before Rdio could pick up more users.