[iMore.com]

The Apple TV channel authorization experience is horrible, and it's all the content providers' fault.
Setting up an Apple TV for basic streaming and iTunes access is ridiculously easy: Plug it in, turn it on, then hold your iPhone or iPad to the top of the Apple TV. The Apple TV copies Wi-Fi and iTunes account information from the iOS device and you're off and running. When it comes time to watch stuff from cable channels, however, the setup process becomes a nightmare.

Full story from the iMore Blog...