Along with “multitasking”, Airplay is easily the best new feature of iOS 4.2. It lets you beam music and video from an iPhone or iPad to compatible speakers, Airport Expresses or AppleTVs. Best of all, it is easy and always works.
But what if you want to send some video to the big-screen iMac you use as a media center? Tough. Unless you grab Erica Sadun’s AirPlayer, a Mac App that turns your computer into one giant AppleTV.
It is ingeniously simple. The app runs a Bonjour server on the Mac which identifies