When you hear "Kazaa", you probably think of the illegal peer-to-peer file sharing application that became so popular around 2001. What you might not remember is that the company took the legit route back in 2009 when it became a legal music subscription service.
The company recently launched an iPhone application which allows you to stream music, just like you can with Rdio, Pandora, or Spotify. The downside? There's a membership fee of $10/month to use the app...