Air Microphone is a U.S. $ 0.99 app that uses AirPlay to connect your iPhone to an Apple TV or AirPlay-equipped amplifier to give you a wireless microphone.
The app is not hard to use. After launch, go to the multitasking bar on the iPhone and select any AirPlay device and start talking. In my tests, the app worked pretty well on an AppleTV with a few caveats. There are options for 3 EQ settings. 'Normal' was just fine. 'Less Bass' made me sound like a parrot, and 'More Bass' made me sound like a giant Cyclops. Way too thundering, if you get my drift. The app also lets you select a photo to display on the Apple TV during your talk, but the image is proportioned like the iPhone screen in portrait mode, so I don't thin
