First she managed to stream videos to the AppleTV via 3rd party apps and now, Erica Sadun, did it again. Introducing AirPlayer for Mac. What AirPlayer does is create and advertise a custom Bonjour AirPlay service that pretends to be an Apple TV.
Bonjour is Apple’s zero configuration networking solution for allowing devices and applications to communicate with each other over local area networks. When Apple created AirPlay, it basically set up a new way for Apple TV to interact with iOS using Bonjour communications.
By interacting with iOS devices the same way that Apple TV does and providing the same kinds of services and feedback, AirPlayer allows you to use your iDevice’s built in AirPlay support to send video to your Mac.
Download an ‘extremely alpha version’ of AirPlayer here