On the topic of iPad 4.2 and Apple TV 4.1, the first version combination to support video streaming via AirPlay, we might as well get all the caveats out of the way first. Yes, you still can't push streaming audio or video from your Mac to your iPad without third-party apps. No, you can't use AirPlay to show videos from your iPhone's camera roll, and people are plenty steamed about that. It's not a codec issue, as iTunes can easily stream the same videos to the Apple TV, so most likely the iPhone 4's AirPlay implementation isn't quite fully baked yet to handle those strea
