updated 06:15 pm EDT, Tue March 15, 2011
iMovie, ESPN, Discovery, Vevo, Air Video included
Apple is now actively promoting AirPlay-capable apps on the App Store. A section in the storefront groups together titles that exploit the recently-enhanced streaming feature, which pushes content to an Apple TV. Some titles central to the promotion include Air Video, which streams non-native media like AVI and MKV files, and Discovery Channel HD, an iPad app that offers access to clips from Discovery TV. Foremost, though, is Apple's own iMovie editing tool.
Some other apps in the promotion are My Daily Clip, ESPN the Magazine for iPad, MLS MatchDay 2011, Martha Stewart Makes Cookies, Fitness Class, Authentic Yoga, Baseball Gameplan and Golfplan. The current incarnation of AirPlay requires at least iOS 4.3 on an iPad, iPhone 4 or iPod touch, and v4.2 firmware on the Apple TV.
iOS 4.3 is generally considered essential to improving the usefulness of AirPlay. Prior to the update, AirPlay could only be found in Apple's integrated audio and video playback controls. The v4.3 code enables AirPlay in third-party apps, as well as Safari and Photos.