Haven't seen this covered anywhere, but there's a qwerk in iOS 4.3 that lets you play Hulu Plus over AirPlay. To do it, you need to start a video playing in some other AirPlay enabled app, say for example YouTube. Get the video playing over AirPlay so that it displays on the AppleTV. Now open up the Hulu Plus app and start playing a show; it'll automatically start playing the video on the last known destination, which in this case is the AppleTV. It's clearly not supported by the Hulu app yet, but the API gets tricked on the backside.