While you could use an Android device to capture iTunes Radio streams before, DoubleTwist's latest AirPlay Recorder update brings that functionality to Cupertino's desktops. Based on the walk-through that the outfit lists on its blog, the Mac app seems pretty simple to implement too. First, select the app as an AirPlay device and then start playing a song or station. That's it. While some might scoff at the price ($10), convenience doesn't always come free.