Want to watch free live TV on your iOS device without having to jailbreak? Aero TV is a great new app with 50+ channels (and currently growing). The app has dedicated servers which means less buffering and also allows you to mirror AirPlay the channels directly to your TV.
Live Wire is a neat little app that side-loads onto your iOS device allowing you to watch live HD channels. Sky Sports, BT Sports, Sky Movies and many more.